Wrote Letter L-304 of 1696-09-12 to Anthonie Heinsius about rennet and curd, chalk and crab's-eyes in vinegar, smoking tobacco to cure toothache, the gall-bladder and omasum of a calf, milk-clotting, and his contradiction of a physician

September 12, 1696
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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 …

A certain physician, who alleged that acid and fish are unwholesome, is contradicted by L. Research on rennet and curd from calves' stomachs. Experiments with rennet in vinegar, wine, and his own blood. Tests with chalk and crab's-eyes in vinegar. Research to find out whether the bitter taste of rennet is perhaps caused by bile. Anatomy of the duct opening out of the gall-bladder of a calf. Use of smoking tobacco as a remedy against toothache. Anatomy of the omasum of the calf. Balls of hair from the rumen. Remarks about the use of milk-clotting for different kinds of mammals.