History of encyclopedias
   HOME

TheInfoList



OR:

Encyclopedias An encyclopedia (American English) or encyclopædia (British English) is a reference work or compendium providing summaries of knowledge either general or special to a particular field or discipline. Encyclopedias are divided into articles ...
have progressed from the beginning of history in written form, through medieval and modern times in print, and most recently, displayed on computer and distributed via computer networks.


Western encyclopedias


Ancient times

Encyclopedias have existed for around 2,000 years, although even older glossaries such as the Babylonian '' Urra=hubullu'' and the ancient Chinese '' Erya'' are also sometimes described as "encyclopedias".


Marcus Terentius Varro

Marcus Terentius Varro Marcus Terentius Varro (; 116–27 BC) was a Roman polymath and a prolific author. He is regarded as ancient Rome's greatest scholar, and was described by Petrarch as "the third great light of Rome" (after Vergil and Cicero). He is sometimes calle ...
(; 116 BC – 27 BC) was an ancient Roman scholar and writer. His ''Nine Books of Disciplines'' became a model for later encyclopedists, especially
Pliny the Elder Gaius Plinius Secundus (AD 23/2479), called Pliny the Elder (), was a Roman author, naturalist and natural philosopher, and naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic ' ...
. The most noteworthy portion of the ''Nine Books of Disciplines'' is its use of the
liberal arts Liberal arts education (from Latin "free" and "art or principled practice") is the traditional academic course in Western higher education. ''Liberal arts'' takes the term '' art'' in the sense of a learned skill rather than specifically th ...
as organizing principles. Varro decided to focus on identifying nine of these arts:
grammar In linguistics, the grammar of a natural language is its set of structural constraints on speakers' or writers' composition of clauses, phrases, and words. The term can also refer to the study of such constraints, a field that includes domain ...
, rhetoric,
logic Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences or of logical truths. It is a formal science investigating how conclusions follow from premise ...
, arithmetic,
geometry Geometry (; ) is, with arithmetic, one of the oldest branches of mathematics. It is concerned with properties of space such as the distance, shape, size, and relative position of figures. A mathematician who works in the field of geometry is ...
,
astronomy Astronomy () is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, g ...
,
musical theory Music theory is the study of the practices and possibilities of music. ''The Oxford Companion to Music'' describes three interrelated uses of the term "music theory". The first is the " rudiments", that are needed to understand music notation (k ...
,
medicine Medicine is the science and practice of caring for a patient, managing the diagnosis, prognosis, prevention, treatment, palliation of their injury or disease, and promoting their health. Medicine encompasses a variety of health care pr ...
, and
architecture Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing building ...
. Using Varro's list, subsequent writers defined the seven classical "liberal arts of the medieval schools".


Pliny the Elder

The earliest encyclopedic work to have survived to modern times is the ''
Naturalis Historia The ''Natural History'' ( la, Naturalis historia) is a work by Pliny the Elder. The largest single work to have survived from the Roman Empire to the modern day, the ''Natural History'' compiles information gleaned from other ancient authors. ...
'' of
Pliny the Elder Gaius Plinius Secundus (AD 23/2479), called Pliny the Elder (), was a Roman author, naturalist and natural philosopher, and naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic ' ...
, a
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *'' Epistle to the Romans'', shortened to ''Romans'', a lette ...
statesman living in the 1st century AD. He compiled a work of 37 chapters covering natural history, architecture, medicine,
geography Geography (from Greek: , ''geographia''. Combination of Greek words ‘Geo’ (The Earth) and ‘Graphien’ (to describe), literally "earth description") is a field of science devoted to the study of the lands, features, inhabitants, an ...
, geology, and all aspects of the world around him. He stated in the preface that he had compiled 20,000 facts from 2000 works by over 200 authors, and added many others from his own experience. The work was published around AD 77–79, although he probably never finished proofing the work before his death in the eruption of
Vesuvius Mount Vesuvius ( ; it, Vesuvio ; nap, 'O Vesuvio , also or ; la, Vesuvius , also , or ) is a somma- stratovolcano located on the Gulf of Naples in Campania, Italy, about east of Naples and a short distance from the shore. It is one of ...
in AD 79.Naturalis Historia
My subject is a barren one – the world of nature, or in other words life; and that subject in its least elevated department, and employing either rustic terms or foreign, many barbarian words that actually have to be introduced with an apology. Moreover, the path is not a beaten highway of authorship, nor one in which the mind is eager to range: there is not one of us who has made the same venture, nor yet one Greek who has tackled single-handed all departments of the subject.
He also elaborates on the difficulties of writing such a work:
It is a difficult task to give novelty to what is old, authority to what is new, brilliance to the common-place, light to the obscure, attraction to the stale, credibility to the doubtful, but nature to all things and all her properties to nature.
This work became very popular in Antiquity, and survived, with many copies being made and distributed in the western world. It was one of the first classical manuscripts to be printed in 1470, and has remained popular ever since as a source of information on the
Roman Roman or Romans most often refers to: *Rome, the capital city of Italy *Ancient Rome, Roman civilization from 8th century BC to 5th century AD *Roman people, the people of ancient Rome *'' Epistle to the Romans'', shortened to ''Romans'', a lette ...
world, and especially
Roman art The art of Ancient Rome, and the territories of its Republic and later Empire, includes architecture, painting, sculpture and mosaic work. Luxury objects in metal-work, gem engraving, ivory carvings, and glass are sometimes considered to be min ...
,
Roman technology Roman technology is the collection of antiques, skills, methods, processes, and engineering practices which supported Roman civilization and made possible the expansion of the economy and military of ancient Rome (753 BC – 476 AD). The Roma ...
and Roman engineering. It is also a recognised source for
medicine Medicine is the science and practice of caring for a patient, managing the diagnosis, prognosis, prevention, treatment, palliation of their injury or disease, and promoting their health. Medicine encompasses a variety of health care pr ...
,
art Art is a diverse range of human activity, and resulting product, that involves creative or imaginative talent expressive of technical proficiency, beauty, emotional power, or conceptual ideas. There is no generally agreed definition of wha ...
, mineralogy,
zoology Zoology ()The pronunciation of zoology as is usually regarded as nonstandard, though it is not uncommon. is the branch of biology that studies the animal kingdom, including the structure, embryology, evolution, classification, habits, and ...
,
botany Botany, also called , plant biology or phytology, is the science of plant life and a branch of biology. A botanist, plant scientist or phytologist is a scientist who specialises in this field. The term "botany" comes from the Ancient Greek w ...
,
geology Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Ea ...
and many other topics not discussed by other classical authors. Among many interesting entries are those for the
elephant Elephants are the largest existing land animals. Three living species are currently recognised: the African bush elephant, the African forest elephant, and the Asian elephant. They are the only surviving members of the family Elephantidae ...
and the
murex ''Murex'' is a genus of medium to large sized predatory tropical sea snails. These are carnivorous marine gastropod molluscs in the family Muricidae, commonly called "murexes" or "rock snails".Houart, R.; Gofas, S. (2010). Murex Linnaeus, 175 ...
snail, the much sought-after source of
Tyrian purple Tyrian purple ( grc, πορφύρα ''porphúra''; la, purpura), also known as Phoenician red, Phoenician purple, royal purple, imperial purple, or imperial dye, is a reddish-purple natural dye. The name Tyrian refers to Tyre, Lebanon. It i ...
dye. Although his work has been criticized for the lack of candor in checking the "facts", some of his text has been confirmed by recent research, like the spectacular remains of Roman
gold mines Gold mining is the extraction of gold resources by mining. Historically, mining gold from alluvial deposits used manual separation processes, such as gold panning. However, with the expansion of gold mining to ores that are not on the surface, ...
in
Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...
, especially at
Las Médulas Las Médulas () is a historic gold-mining site near the town of Ponferrada in the comarca of El Bierzo (province of León, Castile and León, Spain). It was the most important gold mine, as well as the largest open-pit gold mine in the entire ...
, which Pliny probably saw in operation while a
Procurator Procurator (with procuracy or procuratorate referring to the office itself) may refer to: * Procurator, one engaged in procuration, the action of taking care of, hence management, stewardship, agency * ''Procurator'' (Ancient Rome), the title o ...
there a few years before he compiled the encyclopedia. Although many of the
mining Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit. The exploitation of these deposits for raw material is based on the economic ...
methods are now redundant, such as
hushing Hushing is an ancient and historic mining method using a flood or torrent of water to reveal mineral veins. The method was applied in several ways, both in prospecting for ores, and for their exploitation. Mineral veins are often hidden below ...
and
fire-setting Fire-setting is a method of traditional mining used most commonly from Prehistory, prehistoric times up to the Middle Ages. Fires were set against a rock face to heat the Rock (geology), stone, which was then doused with liquid, causing the sto ...
, it is Pliny who recorded them for posterity, thereby helping us understand their importance in a modern context. Pliny makes clear the fact in the preface to his work that he had checked his facts by reading and comparing the works of others, as well as referring to them by name. Many such books are now lost works and remembered only by his references, much like the lost sources mentioned in the work of
Vitruvius Vitruvius (; c. 80–70 BC – after c. 15 BC) was a Roman architect and engineer during the 1st century BC, known for his multi-volume work entitled '' De architectura''. He originated the idea that all buildings should have three attribut ...
a century earlier.


Middle Ages

The work ''De nuptiis Mercurii et Philologiae'' ("About the wedding of Mercury and Philologia") written by
Martianus Capella Martianus Minneus Felix Capella (fl. c. 410–420) was a jurist, polymath and Latin prose writer of late antiquity, one of the earliest developers of the system of the seven liberal arts that structured early medieval education. He was a nati ...
(4th-5th century) was very influential on the successive medieval encyclopedias. It consists in a complete encyclopedia of classical erudition. It firstly introduced the division and classification of the seven
liberal arts Liberal arts education (from Latin "free" and "art or principled practice") is the traditional academic course in Western higher education. ''Liberal arts'' takes the term '' art'' in the sense of a learned skill rather than specifically th ...
(
trivium The trivium is the lower division of the seven liberal arts and comprises grammar, logic, and rhetoric. The trivium is implicit in ''De nuptiis Philologiae et Mercurii'' ("On the Marriage of Philology and Mercury") by Martianus Capella, but t ...
and
quadrivium From the time of Plato through the Middle Ages, the ''quadrivium'' (plural: quadrivia) was a grouping of four subjects or arts—arithmetic, geometry, music, and astronomy—that formed a second curricular stage following preparatory work in the ...
), followed by many successive works along the
Middle Ages In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire ...
. The first Christian encyclopedia was the ''Institutiones divinarum et saecularium litterarum'' of
Cassiodorus Magnus Aurelius Cassiodorus Senator (c. 485 – c. 585), commonly known as Cassiodorus (), was a Roman statesman, renowned scholar of antiquity, and writer serving in the administration of Theodoric the Great, king of the Ostrogoths. ''Senator'' ...
(543-560), which were divided in two parts: the first one dealt with Christian Divinity; the second one described the seven liberal arts. Saint Isidore of Seville, one of the greatest scholars of the early Middle Ages, is widely recognized as being the author of the first known encyclopedia of the Middle Ages, the ''
Etymologiae ''Etymologiae'' (Latin for "The Etymologies"), also known as the ''Origines'' ("Origins") and usually abbreviated ''Orig.'', is an etymological encyclopedia compiled by Isidore of Seville (c. 560–636) towards the end of his life. Isidore was ...
'' or ''Origines'' (around 630), in which he compiled a sizable portion of the learning available at his time, both ancient and modern. The encyclopedia has 448 chapters in 20 volumes, and is valuable because of the quotes and fragments of texts by other authors that would have been lost had they not been collected by Saint Isidore. The most popular encyclopedia of the Carolingian Age was the ''De universo'' or ''De rerum naturis'' by Rabanus Maurus, written about 830, which was based on the ''Etymologiae''. Many encyclopedic works were written during the 12th and 13th centuries. Among them was ''
Hortus deliciarum __NOTOC__ The ''Hortus deliciarum'' (Latin for ''Garden of Delights'') was a medieval manuscript compiled by Herrad of Landsberg at the Hohenburg Abbey in Alsace, better known today as Mont Sainte-Odile. Description The ''Hortus deliciarum'' ...
'' (1167–1185) by
Herrad of Landsberg Herrad of Landsberg ( la, Herrada Landsbergensis; 1130 – July 25, 1195) was a 12th-century Alsatian nun and abbess of Hohenburg Abbey in the Vosges mountains. She was known as the author of the pictorial encyclopedia '' Hortus deliciarum'' (' ...
, which is thought to be the first encyclopedia written by a woman. '' De proprietatibus rerum'' by
Bartholomeus Anglicus Bartholomaeus Anglicus (before 1203–1272), also known as Bartholomew the Englishman and Berthelet, was an early 13th-century Scholastic of Paris, a member of the Franciscan order. He was the author of the compendium ''De proprietatibus rerum' ...
(1240) is often described as the most widely read and quoted encyclopedia in the
High Middle Ages The High Middle Ages, or High Medieval Period, was the period of European history that lasted from AD 1000 to 1300. The High Middle Ages were preceded by the Early Middle Ages and were followed by the Late Middle Ages, which ended around AD 150 ...
,See "Encyclopedia" in ''
Dictionary of the Middle Ages The ''Dictionary of the Middle Ages'' is a 13-volume encyclopedia of the Middle Ages published by the American Council of Learned Societies between 1982 and 1989. It was first conceived and started in 1975 with American medieval historian Jo ...
''.
while
Vincent of Beauvais Vincent of Beauvais ( la, Vincentius Bellovacensis or ''Vincentius Burgundus''; c. 1264) was a Dominican friar at the Cistercian monastery of Royaumont Abbey, France. He is known mostly for his ''Speculum Maius'' (''Great mirror''), a major work ...
's '' Speculum Majus'' (1260) was the most ambitious encyclopedia in the late-medieval period, at over 3 million words. The first encyclopedias in vernacular languages were translations or abridgements of works in
Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...
. Among them, the most famous is ''Li livre dou Trésor'', written in French by the Florentine
Brunetto Latini Brunetto Latini (who signed his name ''Burnectus Latinus'' in Latin and ''Burnecto Latino'' in Italian; –1294) was an Italian philosopher, scholar, notary, politician and statesman. Life Brunetto Latini was born in Florence in 1220 to a Tusc ...
. It is mainly based on the ''Speculum Majus''. The works by the
Flemish Flemish (''Vlaams'') is a Low Franconian dialect cluster of the Dutch language. It is sometimes referred to as Flemish Dutch (), Belgian Dutch ( ), or Southern Dutch (). Flemish is native to Flanders, a historical region in northern Belgium; ...
Jacob van Maerlant, as a whole, are regarded as an encyclopedia. These works, too, are based on former Latin texts. In late medieval Europe, several authors had the ambition of compiling the sum of human knowledge in a certain field or overall, for example Bartholomew of England,
Vincent of Beauvais Vincent of Beauvais ( la, Vincentius Bellovacensis or ''Vincentius Burgundus''; c. 1264) was a Dominican friar at the Cistercian monastery of Royaumont Abbey, France. He is known mostly for his ''Speculum Maius'' (''Great mirror''), a major work ...
, Radulfus Ardens, Sydrac,
Brunetto Latini Brunetto Latini (who signed his name ''Burnectus Latinus'' in Latin and ''Burnecto Latino'' in Italian; –1294) was an Italian philosopher, scholar, notary, politician and statesman. Life Brunetto Latini was born in Florence in 1220 to a Tusc ...
, Giovanni da Sangiminiano,
Pierre Bersuire Pierre Bersuire (c. 1290–1362), also known as Pierre Bercheure and Pierre Berchoire (in Latin, Petrus Berchorius or Petrus Bercorius), was a French author of the Middle Ages. A Benedictine, he was a translator, encyclopaedist, and the auth ...
. Some were women, like
Hildegard of Bingen Hildegard of Bingen (german: Hildegard von Bingen; la, Hildegardis Bingensis; 17 September 1179), also known as Saint Hildegard and the Sibyl of the Rhine, was a German Benedictine abbess and polymath active as a writer, composer, philosopher ...
and
Herrad of Landsberg Herrad of Landsberg ( la, Herrada Landsbergensis; 1130 – July 25, 1195) was a 12th-century Alsatian nun and abbess of Hohenburg Abbey in the Vosges mountains. She was known as the author of the pictorial encyclopedia '' Hortus deliciarum'' (' ...
. The most successful of those publications were the ''
Speculum Maius ''Speculum maius'' (greater Mirror) was a major encyclopedia of the Middle Ages, written by Vincent de Beauvais in the 13th century. It was a great compendium of all knowledge of the time. The work seems to have consisted of three parts: the ''Spe ...
(Great Mirror)'' of
Vincent of Beauvais Vincent of Beauvais ( la, Vincentius Bellovacensis or ''Vincentius Burgundus''; c. 1264) was a Dominican friar at the Cistercian monastery of Royaumont Abbey, France. He is known mostly for his ''Speculum Maius'' (''Great mirror''), a major work ...
and the ''De proprietatibus rerum (On the Properties of Things)'' by Bartholomew of England. The latter was translated (or adapted) into French, Provençal,
Italian Italian(s) may refer to: * Anything of, from, or related to the people of Italy over the centuries ** Italians, an ethnic group or simply a citizen of the Italian Republic or Italian Kingdom ** Italian language, a Romance language *** Regional Ita ...
,
English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ide ...
,
Flemish Flemish (''Vlaams'') is a Low Franconian dialect cluster of the Dutch language. It is sometimes referred to as Flemish Dutch (), Belgian Dutch ( ), or Southern Dutch (). Flemish is native to Flanders, a historical region in northern Belgium; ...
,
Anglo-Norman Anglo-Norman may refer to: *Anglo-Normans, the medieval ruling class in England following the Norman conquest of 1066 * Anglo-Norman language **Anglo-Norman literature * Anglo-Norman England, or Norman England, the period in English history from 10 ...
,
Spanish Spanish might refer to: * Items from or related to Spain: **Spaniards are a nation and ethnic group indigenous to Spain **Spanish language, spoken in Spain and many Latin American countries **Spanish cuisine Other places * Spanish, Ontario, Can ...
, and
German German(s) may refer to: * Germany (of or related to) ** Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...
during the Middle Ages. Both were written in the middle of the 13th century. No medieval encyclopedia bore the title ''Encyclopaedia'' – they were often called ''On nature (De natura, De naturis rerum)'', ''Mirror (Speculum maius, Speculum universale)'', ''Treasure (Trésor)''. The first encyclopedic work to adopt a single alphabetical order for entries across a variety of topics was the fourteenth-century '' Omne Bonum'', compiled by James le Palmer.


Renaissance

These works were all hand copied and thus rarely available, beyond wealthy patrons or monastic men of learning: they were expensive, and usually written for those extending knowledge rather than those using it. During the
Renaissance The Renaissance ( , ) , from , with the same meanings. is a period in European history The history of Europe is traditionally divided into four time periods: prehistoric Europe (prior to about 800 BC), classical antiquity (800 BC to AD ...
, the creation of
printing Printing is a process for mass reproducing text and images using a master form or template. The earliest non-paper products involving printing include cylinder seals and objects such as the Cyrus Cylinder and the Cylinders of Nabonidus. The ...
allowed a wider diffusion of encyclopedias and every scholar could have his or her own copy. In 1493, the Nuremberg Chronicle was produced, containing hundreds of illustrations, of historical figures, events and geographical places. Written as an encyclopedic chronicle, it remains one of the best-documented early printed books—an
incunabulum In the history of printing, an incunable or incunabulum (plural incunables or incunabula, respectively), is a book, pamphlet, or broadside that was printed in the earliest stages of printing in Europe, up to the year 1500. Incunabula were p ...
—and one of the first to successfully integrate illustrations and text. Illustrations depicted many never before illustrated major cities in Europe and the Near East. 645 original woodcuts were used for the illustrations. The ''De expetendis et fugiendis rebus'' by Giorgio Valla was posthumously printed in 1501 by Aldo Manuzio in
Venice Venice ( ; it, Venezia ; vec, Venesia or ) is a city in northeastern Italy and the capital of the Veneto region. It is built on a group of 118 small islands that are separated by canals and linked by over 400 bridges. The isla ...
. This work followed the traditional scheme of liberal arts. However, Valla added the translation of ancient Greek works on mathematics (firstly by Archimedes), newly discovered and translated. The ''Margarita Philosophica'' by
Gregor Reisch Gregor Reisch (c. 1467 - 9 May 1525) was a German Carthusian monk and humanist scholar. He is best known for his compilation ''Margarita Philosophica'', one of the earliest printed encyclopedias of general knowledge. Life Reisch was born at Balin ...
, printed in 1503, was a complete encyclopedia explaining the seven liberal arts. Much encyclopaedism of the
French Renaissance The French Renaissance was the cultural and artistic movement in France between the 15th and early 17th centuries. The period is associated with the pan-European Renaissance, a word first used by the French historian Jules Michelet to define th ...
was based upon the notion of not including every fact known to humans, but only that knowledge that was necessary, where necessity was judged by a wide variety of criteria, leading to works of greatly varying sizes. Béroalde de Verville laid the foundation for his encyclopaedic works in a hexameral poem entitled ''Les cognoissances nécessaires'' for example. Often, the criteria had moral bases, such as in the case of
Pierre de La Primaudaye Pierre de La Primaudaye (1546–1619) was a French writer. He is known particularly for ''L'Academie Française'', which was influential in English translations, from 1584 onwards, particularly ''The French Academie'' of 1618. La Primaudaye came ...
's ''L'Académie française'' and Guillaume Telin's ''Bref sommaire des sept vertus &c.''. Encyclopaedists encountered several problems with this approach, including how to decide what to omit as unnecessary, how to structure knowledge that resisted structure (often simply as a consequence of the sheer amount of material that deserved inclusion), and how to cope with the influx of newly discovered knowledge and the effects that it had on prior structures. The term ''encyclopaedia'' was coined by 16th-century humanists who misread copies of their texts of
Pliny Pliny may refer to: People * Pliny the Elder (23–79 CE), ancient Roman nobleman, scientist, historian, and author of ''Naturalis Historia'' (''Pliny's Natural History'') * Pliny the Younger (died 113), ancient Roman statesman, orator, w ...
and Quintilian, and combined the two Greek words "''enkyklios paedia''" into one word, έγκυκλοπαιδεία. The phrase ''enkyklios paedia'' (ἐγκύκλιος παιδεία) was used by Plutarch and the Latin word encyclopaedia came from him. The first work titled in this way was the ''Encyclopedia orbisque doctrinarum, hoc est omnium artium, scientiarum, ipsius philosophiae index ac divisio'' written by
Johannes Aventinus Johann Georg Turmair (or Thurmayr) (4 July 1477 – 9 January 1534), known by the pen name Johannes Aventinus (Latin for "John of Abensberg") or Aventin, was a Bavarian Renaissance humanist historian and philologist. He authored the 1523 ...
in 1517. The English physician and philosopher, Sir Thomas Browne used the word 'encyclopaedia' in 1646 in the prefac
to the reader
to define his ''
Pseudodoxia Epidemica ''Pseudodoxia Epidemica or Enquiries into very many received tenents and commonly presumed truths'', also known simply as ''Pseudodoxia Epidemica'' or ''Vulgar Errors'', is a work by Thomas Browne challenging and refuting the "vulgar" or common ...
'', a major work of the 17th-century scientific revolution. Browne structured his encyclopaedia upon the time-honoured scheme of the Renaissance, the so-called 'scale of creation' which ascends through the mineral, vegetable, animal, human, planetary, and cosmological worlds. ''Pseudodoxia Epidemica'' was a European best-seller, translated into French, Dutch, and German as well as Latin it went through no fewer than five editions, each revised and augmented, the last edition appearing in 1672. Financial, commercial, legal, and intellectual factors changed the size of encyclopedias. During the
Renaissance The Renaissance ( , ) , from , with the same meanings. is a period in European history The history of Europe is traditionally divided into four time periods: prehistoric Europe (prior to about 800 BC), classical antiquity (800 BC to AD ...
, middle classes had more time to read and encyclopedias helped them to learn more. Publishers wanted to increase their output so some countries like Germany started selling books missing alphabetical sections, to publish faster. Also, publishers could not afford all the resources by themselves, so multiple publishers would come together with their resources to create better encyclopedias. When publishing at the same rate became financially impossible, they turned to subscriptions and serial publications. This was risky for publishers because they had to find people who would pay all upfront or make payments. When this worked, capital would rise and there would be a steady income for encyclopedias. Later, rivalry grew, causing copyright to occur due to weak underdeveloped laws. Some publishers would copy another publisher's work to produce an encyclopedia faster and cheaper so consumers did not have to pay as much and thus could sell more. Encyclopedias made it to where middle-class citizens could basically have a small library in their own house. Europeans were becoming more curious about their society around them causing them to revolt against their government.


Traditional encyclopedias


Rise of printed encyclopedias

The beginnings of the modern idea of the general-purpose, widely distributed printed encyclopedia precede the 18th century encyclopedists. However,
Chambers Chambers may refer to: Places Canada: *Chambers Township, Ontario United States: *Chambers County, Alabama * Chambers, Arizona, an unincorporated community in Apache County * Chambers, Nebraska * Chambers, West Virginia * Chambers Township, Hol ...
' ''
Cyclopædia, or an Universal Dictionary of Arts and Sciences ''Cyclopædia: or, An Universal Dictionary of Arts and Sciences'' is an encyclopedia prepared by Ephraim Chambers and first published in 1728; six more editions appeared between 1728 and 1751 with a ''Supplement'' in 1753. The ''Cyclopædia'' ...
'' (1728), and the ''
Encyclopédie ''Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métiers'' (English: ''Encyclopedia, or a Systematic Dictionary of the Sciences, Arts, and Crafts''), better known as ''Encyclopédie'', was a general encyclopedia publis ...
'' of Diderot and D'Alembert (1751 onwards), as well as ''
Encyclopædia Britannica The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various t ...
'' and the '' Conversations-Lexikon'', were the first to realize the form we would recognize today, with a comprehensive scope of topics, discussed in depth and organized in an accessible, systematic method. Chambers, in 1728, followed the earlier lead of John Harris's ''
Lexicon Technicum ''Lexicon Technicum: or, Universal English Dictionary of Arts and Sciences: Explaining not only the Terms of Art, but the Arts Themselves'' was in many respects the first alphabetical encyclopedia written in English. Although the emphasis of t ...
'' of 1704 and later editions (see also below); this work was by its title and content "A Universal English Dictionary of Arts and Sciences: Explaining not only the Terms of Art, but the Arts Themselves". John Harris is often credited with introducing the now-familiar alphabetic format in 1704 with his English ''Lexicon Technicum: Or, A Universal English Dictionary of Arts and Sciences: Explaining not only the Terms of Art, but the Arts Themselves'' – to give its full title. Organized alphabetically, its content does indeed contain explanation not merely of the terms used in the arts and sciences, but of the arts and sciences themselves.
Sir Isaac Newton Sir Isaac Newton (25 December 1642 – 20 March 1726/27) was an English mathematician, physicist, astronomer, alchemist, theologian, and author (described in his time as a " natural philosopher"), widely recognised as one of the g ...
contributed his only published work on chemistry to the second volume of 1710. Its emphasis was on science—and conformably to the broad 18th-century understanding of the term 'science', its content extends beyond what would be called science or technology today, and includes topics from the humanities and fine arts, e.g. a substantial number from law, commerce, music, and heraldry. At about 1,200 pages, its scope can be considered as more that of an encyclopedic dictionary than a true encyclopedia. Harris himself considered it a dictionary; the work is one of the first technical dictionaries in any language.
Ephraim Chambers Ephraim Chambers ( – 15 May 1740) was an English writer and encyclopaedist, who is primarily known for producing the '' Cyclopaedia, or a Universal Dictionary of Arts and Sciences''. Biography Chambers was born in Milton near Kendal, Westmor ...
published his '' Cyclopædia'' in 1728. It included a broad scope of subjects, used an alphabetic arrangement, relied on many different contributors and included the innovation of cross-referencing other sections within articles. Chambers has been referred to as the father of the modern encyclopedia for this two-volume work. A French translation of Chambers' work inspired the ''
Encyclopédie ''Encyclopédie, ou dictionnaire raisonné des sciences, des arts et des métiers'' (English: ''Encyclopedia, or a Systematic Dictionary of the Sciences, Arts, and Crafts''), better known as ''Encyclopédie'', was a general encyclopedia publis ...
'', perhaps the most famous early encyclopedia, notable for its scope, the quality of some contributions, and its political and cultural impact in the years leading up to the
French Revolution The French Revolution ( ) was a period of radical political and societal change in France that began with the Estates General of 1789 and ended with the formation of the French Consulate in coup of 18 Brumaire, November 1799. Many of its ...
. The ''Encyclopédie'' was edited by
Jean le Rond d'Alembert Jean-Baptiste le Rond d'Alembert (; ; 16 November 1717 – 29 October 1783) was a French mathematician, mechanician, physicist, philosopher, and music theorist. Until 1759 he was, together with Denis Diderot, a co-editor of the '' Encyclopéd ...
and
Denis Diderot Denis Diderot (; ; 5 October 171331 July 1784) was a French philosopher, art critic, and writer, best known for serving as co-founder, chief editor, and contributor to the '' Encyclopédie'' along with Jean le Rond d'Alembert. He was a promi ...
and published in 17 volumes of articles, issued from 1751 to 1765, and 11 volumes of illustrations, issued from 1762 to 1772. Five volumes of supplementary material and a two volume index, supervised by other editors, were issued from 1776 to 1780 by
Charles-Joseph Panckoucke Charles-Joseph Panckoucke (; 26 November 1736 – 19 December 1798) was a French writer and publisher. He was responsible for numerous influential publications of the era, including the literary journal ''Mercure de France'' and the ''Encyclopéd ...
. The ''Encyclopédie'' represented the essence of the
French Enlightenment French (french: français(e), link=no) may refer to: * Something of, from, or related to France ** French language, which originated in France, and its various dialects and accents ** French people, a nation and ethnic group identified with France ...
. The prospectus stated an ambitious goal: the ''Encyclopédie'' was to be a systematic analysis of the "order and interrelations of human knowledge." Diderot, in hi
''Encyclopédie'' article of the same name
went further: "to collect all the knowledge that now lies scattered over the face of the earth, to make known its general structure to the men among we live, and to transmit it to those who will come after us", to make men not only wiser but also "more virtuous and more happy." Realizing the inherent problems with the model of knowledge he had created, Diderot's view of his own success in writing the ''Encyclopédie'' were far from ecstatic. Diderot envisioned the perfect encyclopedia as more than the sum of its parts. In his own article on the encyclopedia, Diderot also wrote, "Were an analytical dictionary of the sciences and arts nothing more than a methodical combination of their elements, I would still ask whom it behooves to fabricate good elements." Diderot viewed the ideal encyclopedia as an index of connections. He realized that all knowledge could never be amassed in just one large work, but he hoped the relations among the subjects could be. The ''Encyclopédie'' in turn inspired the venerable ''
Encyclopædia Britannica The (Latin for "British Encyclopædia") is a general knowledge English-language encyclopaedia. It is published by Encyclopædia Britannica, Inc.; the company has existed since the 18th century, although it has changed ownership various t ...
'', which had a modest beginning in Scotland: the first edition, issued between 1768 and 1771, had just three hastily completed volumes – A–B, C–L, and M–Z – with a total of 2,391 pages. By 1797, when the third edition was completed, it had been expanded to 18 volumes addressing a full range of topics, with articles contributed by a range of authorities on their subjects. The German-language '' Conversations-Lexikon'' was published at
Leipzig Leipzig ( , ; Upper Saxon: ) is the most populous city in the German state of Saxony. Leipzig's population of 605,407 inhabitants (1.1 million in the larger urban zone) as of 2021 places the city as Germany's eighth most populous, as ...
from 1796 to 1808, in 6 volumes. Paralleling other 18th century encyclopedias, its scope was expanded beyond that of earlier publications, in an effort at comprehensiveness. It was, however, intended not for scholarly use but to provide results of research and discovery in a simple and popular form without extensive detail. This format, a contrast to the ''Encyclopædia Britannica'', was widely imitated by later 19th century encyclopedias in Britain, the United States, France, Spain, Italy and other countries. Of the influential late-18th century and early-19th century encyclopedias, the ''Conversations-Lexikon'' is perhaps most similar in form to today's encyclopedias. The early years of the 19th century saw a flowering of encyclopedia publishing in the United Kingdom, Europe and America. In England ''
Rees's Cyclopædia Rees's ''Cyclopædia'', in full ''The Cyclopædia; or, Universal Dictionary of Arts, Sciences, and Literature'' was an important 19th-century British encyclopaedia edited by Rev. Abraham Rees (1743–1825), a Presbyterian minister and scholar w ...
'' (1802–19) contains an enormous amount in information about the industrial and scientific revolutions of the time. A feature of these publications is the high-quality illustrations made by engravers like
Wilson Lowry Wilson Lowry Fellow of the Royal Society, FRS (24 January 1762 – 23 June 1824) was an English engraver. Life He was born at Whitehaven, Cumberland, the son of :commons:Strickland Lowry, Strickland Lowry, a portrait painter. The family settled ...
of art work supplied by specialist draftsmen like John Farey, Jr. Encyclopedias were published in Scotland, as a result of the Scottish Enlightenment, for education there was of a higher standard than in the rest of the United Kingdom. The National Revival of
Bulgaria Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedo ...
, influenced by the Enlightenment, resulted in
Petar Beron Dr. Petar Beron ( bg, Петър Берон) (c. 1799, Kotel – 21 March 1871) was a Bulgarian educator. He created the first modern Bulgarian primer, known as the '' Fish Primer'' (Рибен буквар, ''Riben bukvar'') due to a dolphin ...
's '' Primer with Various Instructions'' (also known as the ''Fish Primer'') in 1824. It was a small encyclopedia for children, containing fables, proverbs, ancient history, basic
arithmetics Arithmetic () is an elementary part of mathematics that consists of the study of the properties of the traditional operations on numbers—addition, subtraction, multiplication, division, exponentiation, and extraction of roots. In the 19th ce ...
,
zoology Zoology ()The pronunciation of zoology as is usually regarded as nonstandard, though it is not uncommon. is the branch of biology that studies the animal kingdom, including the structure, embryology, evolution, classification, habits, and ...
and
linguistics Linguistics is the science, scientific study of human language. It is called a scientific study because it entails a comprehensive, systematic, objective, and precise analysis of all aspects of language, particularly its nature and structure ...
. Beron later published a 7-volume work in natural sciences known as '' Panepisteme'' in 1867. The 17-volume ''
Grand dictionnaire universel du XIXe siècle The ''Grand dictionnaire universel du XIXe siècle'' (''Great Universal Dictionary of the 19th Century''), often called the ''Grand Larousse du dix-neuvième'', is a French encyclopedic dictionary. It was planned, directed, published, and to a s ...
'' and its supplements were published in France by
Pierre Larousse Pierre Athanase Larousse (23 October 18173 January 1875) was a French grammarian, lexicographer and encyclopaedist. He published many of the outstanding educational and reference works of 19th-century France, including the 15-volume '' Grand di ...
from 1866 to 1890. ''Encyclopædia Britannica'' appeared in various editions throughout the century, and the growth of
popular education Popular education is a concept grounded in notions of class, political struggle, and social transformation. The term is a translation from the Spanish educación popular or the Portuguese educação popular and rather than the English usage ...
and the Mechanics' Institutes, spearheaded by the
Society for the Diffusion of Useful Knowledge The Society for the Diffusion of Useful Knowledge (SDUK) was founded in London in 1826, mainly at the instigation of Whig MP Henry Brougham, with the object of publishing information to people who were unable to obtain formal teaching or who pr ...
led to the production of the ''
Penny Cyclopaedia ''The Penny Cyclopædia'' published by the Society for the Diffusion of Useful Knowledge was a multi-volume encyclopedia edited by George Long and published by Charles Knight alongside the '' Penny Magazine''. Twenty-seven volumes and three sup ...
'', as its title suggests issued in weekly numbers at a penny each like a newspaper. A more commercially successful encyclopaedia then ''Penny Cyclopaedia'' aimed at the same audiences was '' Chambers's Encyclopaedia A Dictionary of Universal Knowledge for the People'', edited by Andrew Findlanter. It was partly based on a translation into English of the 10th edition of the German-language Konversations-Lexikon, which would become the Brockhaus Enzyklopädie. The publishers found it necessary, however, to supplement the core text with a significant amount of additional material, including more tha
4000 illustrations
not present in Brockhaus. Andrew Findlater was the acting editor and spent ten years on the projec
1Chambers's Encyclopaedia
first appeared between 1859 and 1868 in 520 weekly parts at three-halfpence each 4and totalled ten octavo volumes, with 8,320 pages, and over 27,000 articles from over 100 authors. It was also published as bound volumes between 1860 and 1868. In the early 20th century, the ''Encyclopædia Britannica'' reached its eleventh edition, and inexpensive encyclopedias such as ''
Harmsworth's Universal Encyclopaedia ''Harmsworth's Universal Encyclopaedia'' is an encyclopedia edited by John Hammerton and published in London, England by The Education Book Co. Ltd., a subsidiary of Northcliffe's Amalgamated Press, in 1921/22. Aimed at a middle-income market ...
'' and ''
Everyman's Encyclopaedia ''Everyman's Encyclopaedia'' is an encyclopedia published by Joseph Dent from 1913 as part of the Everyman's Library. The set was descended from the 1850s ''English Cyclopaedia'' of 1854, which in turn was based on the ''Penny Cyclopaedia'' of ...
'' were common. Popular and affordable encyclopedias such as ''
Harmsworth's Universal Encyclopaedia ''Harmsworth's Universal Encyclopaedia'' is an encyclopedia edited by John Hammerton and published in London, England by The Education Book Co. Ltd., a subsidiary of Northcliffe's Amalgamated Press, in 1921/22. Aimed at a middle-income market ...
'' and ''
The Children's Encyclopædia ''The Children's Encyclopædia'' was an encyclopaedia originated by Arthur Mee, and published by the Educational Book Company, a subsidiary of Northcliffe's Amalgamated Press, London. It was published from 1908 to 1964. Walter M. Jackson's c ...
'' appeared in the early 1920s. In the United States, the 1950s and 1960s saw the introduction of several large popular encyclopedias, often sold on installment plans. The best known of these were ''
World Book The ''World Book Encyclopedia'' is an American encyclopedia. The encyclopedia is designed to cover major areas of knowledge uniformly, but it shows particular strength in scientific, technical, historical and medical subjects. ''World Book'' w ...
'' and ''
Funk and Wagnalls Funk & Wagnalls was an American publisher known for its reference works, including ''A Standard Dictionary of the English Language'' (1st ed. 1893–5), and the ''Funk & Wagnalls Standard Encyclopedia'' (25 volumes, 1st ed. 1912).Funk & Wagnalls N ...
''. As many as 90% were sold
door to door Door-to-door is a canvassing technique that is generally used for sales, marketing, advertising, evangelism or campaigning, in which the person or persons walk from the door of one house to the door of another, trying to sell or advertise a ...
. Jack Lynch says in his book '' You Could Look It Up'' that encyclopedia salespeople were so common that they became the butt of jokes. He describes their sales pitch saying, "They were selling not books but a lifestyle, a future, a promise of social mobility." A 1961 ''World Book'' ad said, "You are holding your family’s future in your hands right now," while showing a feminine hand holding an order form. The second half of the 20th century also saw the publication of several encyclopedias that were notable for synthesizing important topics in specific fields, often by means of new works authored by significant researchers. Such encyclopedias included ''The Encyclopedia of Philosophy'' (first published in 1967 and now in its second edition), and ''Elsevier's Handbooks In Economics'' series. This trend has continued into the 21st century, producing encyclopedias of at least one volume in size for most if not all
academic discipline An academy (Attic Greek: Ἀκαδήμεια; Koine Greek Ἀκαδημία) is an institution of secondary or tertiary higher learning (and generally also research or honorary membership). The name traces back to Plato's school of philosophy, ...
s, including, typically, such narrow topics such as
bioethics Bioethics is both a field of study and professional practice, interested in ethical issues related to health (primarily focused on the human, but also increasingly includes animal ethics), including those emerging from advances in biology, m ...
and
African-American history African-American history began with the arrival of Africans to North America in the 16th and 17th centuries. Former Spanish slaves who had been freed by Francis Drake arrived aboard the Golden Hind at New Albion in California in 1579. The ...
.


International development

During the 19th and early 20th century, many smaller or less developed languages saw their first encyclopedias, using French, German, and English role models. While encyclopedias in larger languages, having large markets that could support a large editorial staff, churned out new 20-volume works in a few years and new editions with brief intervals, such publication plans often spanned a decade or more in non-European languages. The first large encyclopedia in Russian, '' Brockhaus and Efron Encyclopedic Dictionary'' (86 volumes, 1890–1906), was a direct cooperation with the German Brockhaus. Without such a formal cooperation, the Swedish ''Conversations-lexicon'' (4 volumes, 1821–1826) was a translation of Brockhaus 2nd edition. The first encyclopedia written originally in Swedish was ''Svenskt konversationslexikon'' (4 volumes, 1845–1851) by Per Gustaf Berg. A more ambitious project was '' Nordisk familjebok'', established in 1875 and intended to comprise 6 volumes. But in 1885, when it had published 8 volumes and gotten only halfways (A–K), the publisher turned to the government for extra funding; encyclopedias had become national monuments. It was finished in 1894 with 18 volumes, with two supplement volumes (1896–1899). The first major Danish encyclopedia was ''
Salmonsens Konversationsleksikon ''Salmonsens Konversationsleksikon'' is a Danish encyclopedia that has been published in several editions. The first edition, ''Salmonsens Store Illustrerede Konversationsleksikon'' was published in nineteen volumes 1893–1911 by Brødrene Sa ...
'' (19 volumes, 1893–1911). In Norway, encyclopedias follow the unique history of the
Norwegian language Norwegian ( no, norsk, links=no ) is a North Germanic language spoken mainly in Norway, where it is an official language. Along with Swedish and Danish, Norwegian forms a dialect continuum of more or less mutually intelligible local and regio ...
, the
Bokmål Bokmål () (, ; ) is an official written standard for the Norwegian language, alongside Nynorsk. Bokmål is the preferred written standard of Norwegian for 85% to 90% of the population in Norway. Unlike, for instance, the Italian language, there ...
variant having branched off from Danish during the 19th century. After the national independence in 1905, publisher Aschehoug (owned by
William Martin Nygaard William Martin Nygaard (6 February 1865 – 19 December 1952) was a Norwegian publisher and politician. Personal life Nygaard was born in Kristiansand as the son of educator and linguist Marius Nygaard (1838–1912) and his wife Elisabeth "Elise ...
) hired librarian Haakon Nyhuus to edit ''Illustreret norsk konversationsleksikon'' (6 volumes, 1907–1913), in later editions known as ''Aschehougs konversasjonsleksikon''. In the
Nynorsk Nynorsk () () is one of the two written standards of the Norwegian language, the other being Bokmål. From 12 May 1885, it became the state-sanctioned version of Ivar Aasen's standard Norwegian language ( no, Landsmål) parallel to the Dano-N ...
variant of the language, ''Norsk Allkunnebok'' (10 volumes, 1948–1966) was the only encyclopedia until the arrival of Wikipedia. The first major Finnish encyclopedia was '' Tietosanakirja'' (11 volumes, 1909–1922). Inspired by the minority language example of ''Norsk Allkunnebok'', a Swedish-language encyclopedia of Finland was initiated in 1969 and eventually published as ''
Uppslagsverket Finland ''Uppslagsverket Finland'' ('Encyclopedia Finland') is a Swedish-language encyclopedia with a focus on Finland and in particular Finland-Swedish subjects. The encyclopedia is published by initiative of an association dedicated to this task, ...
'' (3 volumes, 1982–1985; 2nd edition in 5 volumes, 2003–2007). With such a small market, the sales revenue only covered the printing cost, while editors were paid by endowments. In 2009 the entire contents was made available online, free of charge. Already during
czarist Russia The Tsardom of Russia or Tsardom of Rus' also externally referenced as the Tsardom of Muscovy, was the centralized Russian state from the assumption of the title of Tsar by Ivan IV in 1547 until the foundation of the Russian Empire by Peter I ...
n rule, two editions appeared of the Latvian ''Konversācijas vārdnīca'' (2 volumes, 1891–1893; 4 volumes, 1906–1921). The larger ''Latviešu konversācijas vārdnīca'' (21 volumes, A–Tjepolo, 1927–1940) was interrupted by World War II and never completed. After the war, Latvian emigrants in Sweden published ''Latvju enciklopēdija'' (3 volumes, 1950–1956, with a supplement volume in 1962). Soviet authorise published ''Latvijas PSR mazās enciklopēdijas'' (3 volumes, 1967–1970) and ''Latvijas padomju enciklopēdija'' (10 volumes, 1981–1988). Similarly, in the history of
Lithuanian encyclopedias Lithuanian encyclopedias are encyclopedias published in the Lithuanian language or encyclopedias about Lithuania and Lithuania-related topics. The first known attempt to create a Lithuanian encyclopedia was in 1883, when Jonas Jacevičius failed ...
, the ''Lietuviškoji enciklopedija'' (9 volumes A–J, 1933–1941) was interrupted by World War II and never completed. Lithuanian emigrants in the United States published ''Lietuvių enciklopedija'' (35 volumes, 1953–1966). Soviet authorities published ''Mažoji lietuviškoji tarybinė enciklopedija'' (3 volumes, 1966–1971), ''Lietuviškoji tarybinė enciklopedija'' (12 volumes, 1976–1985), and ''
Tarybų Lietuvos enciklopedija ''Tarybų Lietuvos enciklopedija'' or TLE (translation: ''Encyclopedia of Soviet Lithuania'') was an encyclopedia of the Lithuanian SSR, covering topics such as archaeology, history, nature, science, cultural heritage, cities, districts, biographie ...
'' (4 volumes, 1985–1988). First Turkish encyclopedia was Kamus-ül-Ulûm ve’l-Maarif written by Ali Suvai in 1870 after that Ahmet Rifat Efendi's 7 volumes work "Lûgaat-i Tarihiye ve Coğrafiye" (Dictionary of History and Geography) published in Istanbul at 1881.


Emergence of digital and online encyclopedia

Digital technologies and online crowdsourcing allowed encyclopedias to break away from traditional limitations in both breadth and depth of topics covered.


Digital encyclopedias

By the late 20th century, encyclopedias were being published on CD-ROMs for use with personal computers.
Microsoft Microsoft Corporation is an American multinational technology corporation producing computer software, consumer electronics, personal computers, and related services headquartered at the Microsoft Redmond campus located in Redmond, Washin ...
's ''
Encarta ''Microsoft Encarta'' is a discontinued digital multimedia encyclopedia published by Microsoft from 1993 to 2009. Originally sold on CD-ROM or DVD, it was also available on the World Wide Web via an annual subscription, although later article ...
'', launched in 1993, was a landmark example as it had no printed equivalent. Articles were supplemented with video and audio files as well as numerous high-quality images. After sixteen years, Microsoft discontinued the Encarta line of products in 2009. Traditional encyclopedias are written by a number of employed text writers, usually people with an academic degree, and distributed as
proprietary {{Short pages monitor