Johan Conrad van Hasselt (occasionally Johan Coenraad van Hasselt; 24 June 1797 in

Doesburg Doesburg () is a municipality and a city in the eastern Netherlands in the province of Gelderland. Doesburg received city rights in 1237 and had a population of in . The city is situated on the right bank of the River IJssel at its confluence w ...

– 8 September 1823), was a

Dutch Dutch or Nederlands commonly refers to: * Something of, from, or related to the Netherlands ** Dutch people as an ethnic group () ** Dutch nationality law, history and regulations of Dutch citizenship () ** Dutch language () * In specific terms, i ...

physician A physician, medical practitioner (British English), medical doctor, or simply doctor is a health professional who practices medicine, which is concerned with promoting, maintaining or restoring health through the Medical education, study, Med ...

zoologist Zoology ( , ) is the scientific study of animals. Its studies include the structure, embryology, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems. Zoology is one ...

botanist Botany, also called plant science, is the branch of natural science and biology studying plants, especially Plant anatomy, their anatomy, Plant taxonomy, taxonomy, and Plant ecology, ecology. A botanist or plant scientist is a scientist who s ...

and

mycologist Mycology is the branch of biology concerned with the study of fungi, including their taxonomy, genetics, biochemical properties, and use by humans. Fungi can be a source of tinder, food, traditional medicine, as well as entheogens, poison, and ...

. Conrad van Hasselt studied medicine at the

University of Groningen The University of Groningen (abbreviated as UG; , abbreviated as RUG) is a Public university#Continental Europe, public research university of more than 30,000 students in the city of Groningen (city), Groningen, Netherlands. Founded in 1614, th ...

. In 1820 he went on an expedition to the island of

Java Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...

, then part of the colonial Dutch East Indies, with his friend

Heinrich Kuhl Heinrich Kuhl (17 September 1797 – 14 September 1821) was a German people, German naturalist and zoologist. Kuhl was born in Hanau (Hesse, Germany). Between 1817 and 1820, he was the assistant of professor Th. van Swinderen, docent of natural ...

, to study the fauna and flora of the island. They sailed from

Texel Texel (; Texels dialect: ) is a municipality and an island with a population of 13,643 in North Holland, Netherlands. It is the largest and most populated island of the West Frisian Islands in the Wadden Sea. The island is situated north of Den ...

on 11 July, stopping at

Madeira Madeira ( ; ), officially the Autonomous Region of Madeira (), is an autonomous Regions of Portugal, autonomous region of Portugal. It is an archipelago situated in the North Atlantic Ocean, in the region of Macaronesia, just under north of ...

, the

Cape of Good Hope The Cape of Good Hope ( ) is a rocky headland on the Atlantic Ocean, Atlantic coast of the Cape Peninsula in South Africa. A List of common misconceptions#Geography, common misconception is that the Cape of Good Hope is the southern tip of Afri ...

and

Cocos Island Cocos Island () is a volcanic island in the Pacific Ocean administered by Costa Rica, approximately southwest of the Costa Rican mainland. It constitutes the 11th of the 15 districts of Puntarenas Canton of the Puntarenas Province, Province of ...

and arriving in Batavia in December 1820. Kuhl died after eight months, van Hasselt continued the work for another two years before dying (like Kuhl) of disease and exhaustion. This followed a journey to Bantam. They sent the Museum of Leiden 200 skeletons, 200 skins of mammals from 65 species, 2,000 bird skins, 1,400 fish, 300 reptiles and amphibians, and many insects and crustaceans.

Works

* Heinrich Kuhl and Johan Conrad van Hasselt. 1820. Beiträge zur Zoologie und Vergleichende anatomie (Contributions to zoology and comparative anatomy). Ed. Hermann. 212 pp. * 1820 Dissertatio medico-anatomical observation of metamorphosi inauguralis exhibens quarumdam partium Ranae temporariae ... Ed apud I. Oomkens. 51 pp. * Tyson R Roberts. 1993. The freshwater fishes of Java, as observed by Kuhl and van Hasselt in 1820-23. Leiden : Nationaal Natuurhistorisch Museum. 94 pp.

Commemorations

* ''

Hasseltia ''Hasseltia'' is a genus of flowering plants in the family Salicaceae. It contains four species of small to medium-sized trees native to the neotropics, ranging from Mexico south to Brazil and Bolivia.Alford, M.H. 2006. A new species of ''Hasselt ...

'' ( H.B.K. 1825); botanical family

Salicaceae The Salicaceae are the willow family of flowering plants. The traditional family (Salicaceae ''sensu stricto'') includes the willows, poplars. Genetic studies summarized by the Angiosperm Phylogeny Group (APG) have greatly expanded the circumsc ...

. * ''

Hasseltiopsis ''Hasseltiopsis'' is a monotypic genus of flowering plants in the family Salicaceae. It includes a single species, ''Hasseltiopsis dioica'', a tree native to southern Mexico and Costa Rica. Formerly placed in the heterogeneous family Flacourtiace ...

'' (

Sleumer Hermann Otto Sleumer (February 21, 1906 in Saarbrücken – October 1, 1993 in Oegstgeest) was a Dutch botanist of Germany, German birth. The plant genera ''Sleumerodendron'' Robert Virot, Virot (Proteaceae) and ''Sleumeria'' Timothy Michael Arthur ...

1938); botanical family

. * ''

Kuhlhasseltia ''Kuhlhasseltia'' is a genus of orchids (family Orchidaceae) belonging to the subfamily Orchidoideae The Orchidoideae, or the orchidoid orchids, are a subfamily of the orchid family (Orchidaceae) that contains around 3630 species. Species typi ...

'', named with Heinrich Kuhl ( J.J.Sm. 1910); botanical family

Orchidaceae Orchids are plants that belong to the family (biology), family Orchidaceae (), a diverse and widespread group of flowering plants with blooms that are often colourful and fragrant. Orchids are cosmopolitan distribution, cosmopolitan plants that ...

.BHL
Taxonomic literature : a selective guide to botanical publications

References

* Roberts T. R. 1993. The freshwater fishes of Java, as Observed by Kuhl and van Hasselt in 1820-23. Zoologische Vol. 285, verhandelingen. Ed Natuurhistorisch Nationaal Museum. 94 pp.
pdf
1823 deaths 1797 births Dutch zoologists People from Doesburg 19th-century Dutch physicians {{Netherlands-scientist-stub

Works

Commemorations

See also

References