Wrote Letter L-239 of 1694-03-02 to the members of the Royal Society about ear wax and hair, body hair, the amount of sweat secreted from the human body, and the possibility that sperm might penetrate the ovum

March 2, 1694
Standard reference information
Leeuwenhoek's number: 
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Text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren

Leeuwenhoek wrote this letter about …

the structure and origin of ear wax and the small hairs from the external ear passage

particles secreted from human bodies in general

the growth and structure of body hairs

draughtsman instructed to draw magnifyed sheep's wool.

Calculation of the amount of secreted sweat; composition of sweat; on the possibility that sperm might penetrate the ovum.