Theodorus Craanen

friend and colleague
Death or Burial date: 
February 27, 1688

Craanen, a German mathematician and physician and supporter of the notorious Descartes, taught for many years at Leiden University. Noting in the November 1, 1677 letter (AB 35) that Craanen had visited him many times, Leeuwenhoek relates that Craanen's student Johan Ham (later burgemeester of Arnhem) brought him semen from a gonorrhea patient in which he had seen what we now call sperm cells.

Did Craanen help Leeuwenhoek develop his ideas based on Descartes' writing? Does Craanen refer to "globules" in his writing?

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