Foundations of Experimental Biology
The Problems of Generation and Reproduction
Leeuwenhoek's drawings of spermatic animalcules,
from Philosophical Transactions of the Royal Society, 1679.
Readings: Hooke selections in History 338 Reader; E. G. Ruestow, "Leeuwenhoek's perception of the spermatozoa," at http://zygote.swarthmore.edu/fert1a.html