Jan Swammerdam

colleague from Amsterdam who visited but found him hard to reason with
Baptism date: 
February 12, 1637
Burial date: 
February 17, 1680

In addition to Hartsoeker, Swammerdam was the other major Dutch microscopist of the Golden Age. He published in the Royal Society's Philosophical Transactions alongside Leeuwenhoek in vols 8 and 10. Swammerdam put his energy into studying the life cycle of insects and developed influential techniques, including wax injection, for examining, preserving, and dissecting specimens. They visited and corresponded and referred to each other in their letters to others.

Leeuwenhoek wrote to Henry Oldenburg on September 7, 1674 (AB 11):

Dr. Swammerdam hath again within this fortnight visited me twice, accompanied with a Gentleman, to both of which I have shew'd many of these Microscopical Observations, and of such others as I had formerly spoken to him about; perceiving that his speculations are busy upon this subject, and that probably he will discourse more largely of it than I have done hitherto.

Swammerdam wrote to Melchisedec Thevenot on April 28, 1678:

It is impossible to go into discussion with him [Leeuwenhoek], as he is biased, and reasons in a very barbarical way, having no academic education.

Between those two letters, Swammerdam spent the winter of 1675-76 with the mystic Antoinette Bourignon.

The most common portrait of Swammerdam, on the right, does not depict Swammerdam. There is no known portrait of him.

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Extracts of Three Letters: ... The Second, of Dr. Swammerdam, Touching an Un-Usual Rupture of the Mesentery. Phil. Trans. January 1, 1675 10:272-279