Robert Hooke showed the Royal Society microscopical observations of a cock's testicles
Date:
August 10, 1679
For the second week in a row, Hooke's demonstration failed to show the little animals that Leeuwenhoek claimed to be seeing in several letters.
Document:
Birch, History, vol III, p. 501, 31 July 1679 (O.S.) in London:
Mr. Hooke produced and examined the testicles of a cock just killed, but could not perceive any of those small animals in its seed, that had been seen in that of a stone-horse. It was conceived, that the reason was, because the cock was very young, and possibly not fit for generation.
