Wrote Letter L-141 of 1683-10-14 to Anthonie Heinsius in reply to his recent Letter L-139

October 14, 1683
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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.

The original manuscript on one quarto page, written and signed by Leeuwenhoek, is preserved at the Rijksarchief (National Archive) in Den Haag (Inv. No. 13). The letter was not published during his lifetime.

Leeuwenhoek wrote this short reply to his friend Anthonie Heinsius's Lost Letter L-139 of 8 October 1683, in which he offers his thanks for Leeuwenhoek's sending him the observations described in Leeuwenhoek's Letter L-135 of 17 September 1683. It was not published until 1952 in Volume 4 of Alle de Brieven / Collected Letters. Leeuwenhoek enclosed a copy made by clerk Adriaan Landsvelt of Letter L-128 of 16 July 1683 about male seed in egg yolks.