Wrote Letter L-199 of 1688-08-24 to the members of the Royal Society about gnats, horseflies; growth of branches, germination of wheat plants, the soft and hard roe of cod, and the number of sperm in a cod's soft roe

August 24, 1688
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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 sting and the mouth parts of the gnat; the mouth parts of a horse fly; concerns growing branches of vines, lime, gooseberries in normal and inverse way; investigation of germinating wheat plants; the soft and hard roe of cod; the number of spermatozoa in a cod's soft roe.