Willem Piso

Willem Piso (1611 in Leiden – 28 November 1678 in Amsterdam) was a Dutch physician and naturalist who participated as an expedition doctor in Dutch Brazil from 1637 – 1644, sponsored by count Johan Maurits van Nassau-Siegen and the Dutch West India Company. Piso became one of the founders of tropical medicine.

Early life and education Willem Piso (born Willem Pies; c. 1611) was born in Leiden, in the Dutch Republic, to Cornelia van Liesvelt and the church organist Hermann Pies.

He is recorded under several name forms. In Dutch sources he appears as Willem Pies, while in Latin, he is identified as Gulielmus Piso; the genitive form Gulielmi Pisonis appears in titles and dedications. In Portuguese contexts, particularly in connection with his work in Brazil, he is referred to as Guilherme Piso. In botanical nomenclature, the standard author abbreviation "Piso" is used to identify him as the author of plant names. He later continued his education in France, earning his medical degree from the University of Caen on 4 July 1633, about ten years after he first enrolled.

While in Brazil, Piso studied tropical diseases and the medicinal properties of local plants. He contributed observations on health and diet, noting the importance of fresh foods in preventing illness among European soldiers and seamen. Publications Title page of De Indiae utriusque re naturali et medica libri quatuordecim (1658)Together with Georg Marcgrave, and originally published by Joannes de Laet, Piso wrote the Historia Naturalis Brasiliae (1648), an important early Western insight into Brazilian flora and fauna. He also published as part of this work four parts titled De medicina Brasiliense in which he examined tropical diseases and indigenous therapies (including the use of ipecacuanha-root and leaves of the jaborandi ).

Piso collected plants and animals in Brazil. In 1658, he published another work, which is a second edition of the Historia titled De Indiae Utriusque re naturali et medica. He was the sole author of this and he is said to have tried to undermine Markgraf's work, and many careless errors, leading to criticism from Markgraf's brother and even Linnaeus.

Death Piso died on 28 November 1678 in Amsterdam, at about the age of 67.

His name is also commemorated in the mangrove tree crab, Aratus pisonii, and the minor planet 11240 Piso.