On the Nature of the Birth of All Species

Abstract

Chapter 15 presents a theory of conception in human beings and in various animal species that seems to be based on different Greek and Hellenistic ideas. Strikingly, the chapter considers menstruation to be a biological process that is a necessary part of the reproductive cycle, and not, as is the case in Zoroastrian ritual law, a sign of impurity. The accompanying chapter 15A concerns the gender of various creations.