Wrote Letter L-314 of 1697-02-12 to Maarten Etienne van Velden, regretting Van Velden's difficulties caused by his defence of Copernicus and in support, enclosing a copy of a letter from a gentleman in Brabant

February 12, 1697
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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 his regrets that Van Velden, owing to his defence of the Copernican world-picture, has got into difficulties. In support of Van Velden's standpoint, L. enclosed a copy of a letter from a professor in Brabant, whose Copernicanism has been confirmed by Leeuwenhoek's arguments