Wrote Letter L-012 of 1674-07-06 to Henry Oldenburg bout sweat, hair, fat, tears, and improved capillary tubes

July 6, 1674
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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 to Henry Oldenburg about sweat, hair, fat, and tears; improved capillary tubes.

Human and horse sweat. Structure of human and animal hair. The motion of blood in narrow glass-pipes. The structure of fat in cows, sheep and fish. Figures of glass-pipe in the margin.

He mentions that he sent his letter of 1674-06-01 along with glass tubes and specimens via Adriaen Nicolaesz Boogaert (1644-1708), lord of Belois, Delft magistrate, mayor, and manager of the V.O.C., married 25-10-1656 Delft to Anna Briel (1639-1688).