"According to the teaching of philosophy, the process of generation may be compared with the processes which take place in the manufacture of cheese. Thus the male 'sperm' is equivalent to the clotting agent of milk, and the female 'sperm' is equivalent to that of milk. The starting point of the clotting is in the rennet; so the starting-point of the clot 'man ' is in the male semen." Avicenna
"Menstruation has always been of interest, not only to the student of medicine, but to the lay-observer as well." Walter M. Pyle, Anomalies and Curiosities of Medicine
