Listed as a correspondent of Claude Burlet by the Académie des Sciences of Paris

Date: 
March 4, 1699

The French Académie des Sciences began meeting informally in 1666 and in 1699 got its first rules under Louis XIV. Its first official membership list was dated 4 March 1699. It includes Leeuwenhoek as "Nommé correspondant de Burlet", named or appointed correspondent of Claude Burlet, who did not become a member himself until 1707. There is no evidence that Leeuwenhoek was aware that he had received such an appointment.

Burlet (1667-1731) was a medical doctor at the university in Paris and, after 1714, the primary doctor of the king of Spain.

Several of L.'s correspondents and visitors were also involved with the French Academie in various ways. Source: Liste des membres depuis la création de l'Académie des sciences

Christian Huygens - Academician geometer in 1666
 
Gottfried Leibniz - appointed Academician in 1675 - Foreign associate, first holder, appointed by Louis XIV, 28 January 1699
 
Ehrenfried Walther von Tschirnhaus - Academician geometer July 22, 1682 - Foreign associate, first holder, appointed by Louis XIV, 28 January 1699
 
Melchizedek Thévenot - Academician physicist on 10 January 1685
 
Nicolaas Hartsoeker - Foreign associate on 14 February 1699, first holder
 
Isaac Newton - Foreign associate on 21 February 1699, first holder
 
Hans Sloane - appointed correspondent of Jacques Cassini on 4 March 1699 (same day as Leeuwenhoek), foreign associate on 27 March 1709
 
Edmond Halley - Foreign associate on 14 August 1729
 
Herman Boerhaave - Appointed correspondent of Antoine de Jussieu on August 28, 1715, then foreign associate on April 28, 1731
Sources