Letter by Antoni van Leeuwenhoek to Robert Hooke. Figure 2: This is the testicle of a rat in a glass of water, after its skin was taken off. Van Leeuwenhoek had this drawing made by an unknown artist ('laten afteijckenen').
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Title: Rat testicle in glass jar
Creator: Unknown artist, for Antoni van Leeuwenhoek (1632-1723)