Wrote Letter L-442 of 1705-12-29 to the members of the Royal Society about pumice stone, its origins, and its salts, sponge and a theory about how it absorbs water, and coral

December 29, 1705
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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 …

Description of pumice and an explanation of its coming into being. Analysis of salts found in pumice. Description of a shell and of a sea snail, grown over with coral, from a sponge. Description of the structure of a sponge. Speculating about the floating power of a sponge and about the way in which sponges ingest water.

Pumice stone, its origins, and analysing its salts. Sponge and a theory about how it absorbs water. Coral.