Aristotle, Generation of Animals Book 2, 737a

“That [female] substance, even though it possesses all segments of the body in potential, actually exhibits none of them. For it contains those kinds of elements in potential by which the female is distinguished from the male. For just as it happens that at times deformed children come from deformed parents and at times they do not, so too in the same way sometimes female offspring come from females and sometimes they don’t, but males do instead. For the female is like a deformity of the male and menstrual discharge is like semen, but unclean.”

καὶ γὰρ ἐκεῖνο περίττωμα, καὶ πάντα τὰ μόρια ἔχει δυνάμει, ἐνεργείᾳ δ᾿ οὐθέν. καὶ γὰρ τὰ τοιαῦτ᾿ ἔχει μόρια δυνάμει, ᾗ διαφέρει τὸ θῆλυ τοῦ ἄρρενος. ὥσπερ γὰρ καὶ ἐκ πεπηρωμένων ὁτὲ μὲν γίνεται πεπηρωμένα ὁτὲ δ᾿οὔ, οὕτω καὶ ἐκ θήλεος ὁτὲ μὲν θῆλυ ὁτὲ δ᾿ οὔ, ἀλλ᾿ ἄρρεν…

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