Baro, Baru or Baron Urbigerus was a seventeenth-century writer on natural philosophy and

alchemy Alchemy (from the Arabic word , ) is an ancient branch of natural philosophy, a philosophical and protoscientific tradition that was historically practised in China, India, the Muslim world, and Europe. In its Western form, alchemy is first ...

. He is known for his ''Aphorismi Urbigerani'' (1690). This collection of 100

aphorism An aphorism (from Greek ἀφορισμός: ''aphorismos'', denoting 'delimitation', 'distinction', and 'definition') is a concise, terse, laconic, or memorable expression of a general truth or principle. Aphorisms are often handed down by tra ...

s claims to set out completely the theory of the alchemical work, the preparation of the

Philosopher's Stone The philosopher's stone is a mythic alchemical substance capable of turning base metals such as mercury into gold or silver; it was also known as "the tincture" and "the powder". Alchemists additionally believed that it could be used to mak ...

. A shorter collection of 31 aphorisms, contained in it, is known as the ''Circulatum Minus Urbigeranum''.The Alchemy Web Site
Illustrated by Frater Albertus; this book is available in modern translation under the title ''The Philosophical Elixir of Vegetables''. This work exists in German and English versions.

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{{authority control 17th-century alchemists 17th-century German writers 17th-century German male writers German alchemists Alchemists from the Holy Roman Empire