Jan Swammerdam called Leeuwenhoek "biased, and reasons in a very barbarical way"

Date: 
April 28, 1678

In a letter to Thevenot, Swammerdam noted that he began using glass capillary tubes for observing liquids after seeing Leeuwenhoek use them. Swammerdam said of Leeuwenhoek, "It is impossible to get into a discussion with him, as he is biased, and reasons in a very barbarical way, having no academic education."

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