Wrote Letter L-362 of sometime in October 1699 to Ehrenfried von Tschirnhaus about medicines, his aversion to bleeding and purging, and his preference for tea and coffee as medicine; credulity of people who trust impostors and poorly trained physicians

October 1, 1699
Standard reference information
Leeuwenhoek's number: 
Collected Letters 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 use and the effect of medicines. L. describes his aversion to bleeding and purging and his preference for the use of tea and coffee as medicine. The operation of medicines is based on their effect on the blood. L. resists the credulity of many people, who put their trust in impostors and poorly trained physicians.