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Cornelis Isaaks 's Gravesande
neighbor who helped him learn anatomy and dissection techniques
May 18, 1631
December 5, 1691
Gravesande was a medical doctor who attended the University of Leiden beginning in 1651 while Leeuwenhoek, a year younger, was apprenticing in Amsterdam. Gravesande got his medical degree in Angiers, in France, in 1655, the same year that Leeuwenhoek bought his house on the Hippolytusbuurt.
Gravesande's uncle Cornelis Arents owned the house next door to Leeuwenhoek, on the corner of the Hippolytusbuurt and Nieuwstraat.
He was appointed Delft's city anatomist in 1661, succeeding Pieter van der Mast. Gravesande did weekly dissections, Wednesdays at noon, in the Nieuwe Doelen on the Verwersdijk.
Gravesande joined the Veertigraad in 1672.
He served as magistrate in 1680, 1682, and 1683. He and Leeuwenhoek would have come into contact at the Stadhuis as well as at the weekly dissections. Gravesande also served as master of the Orphan's Chamber (1685-1687) and father (1672) and master (1686) of the Meisjeshuis.
In the letter of September 7, 1674, Leeuwenhoek refers to his discussions with a neighbor who, in Leeuwenhoek's words, "encouraged" him. In two other letters a decade later, he mentions a neighbor in similar terms. The editors' running notes to those letters indicate that this neighbor may well have been Gravesande.
According to Houtzager's Snijkunst Verbeeld, 's Gravesande lived on Koornmarkt, now no. 93.
According to the biographical note in Alle de Brieven / Collected Letters (volume 1, pp. 398-401), 's Gravesande lived on the corner of the Nieuwstraat and Hippolytusbuurt, next door to Leeuwenhoek. However, the real estate records ORA 281-283 show that the house was owned before Leeuwenhoek's time by the Cornelis Arents 's Gravesande, the uncle of Dr. Cornelis Isaacs. Cornelis Arents bequeathed it to Francois in 1657. Later, Cornelia (not her cousin the Dr. Cornelis) and husband Jochum Brugman lived there until they sold it to the printer Hendrik Cronevelt.
This portrait of Gravesande (click for larger size) is by Jan Verkolje, who painted Leeuwenhoek's also.
This doctor died five years before his son, the notary of the same name, was admitted.