Introduction; Part I. Methodology in the Study of Aristotle on Female Animals: 1. Feminism, sexism and Aristotle; 2. Consistency in the Generation of Animals; Part II. Reassessing the Generative Role of the Female Animal in Aristotle: 3. Menstrual blood and female semen; 4. Matter; Part III. Reassessing the Generative Role of the Male Animal in Aristotle: 5. The male as efficient and formal cause of generation; 6. Interpretations of Aristotle on the male role in generation; Part IV. Generation in Lower Animals and Particular Instances: 7. Generation in lower animals; 8. Aristotle on sexual differentiation; 9. Aristotle on heredity; 10. Teleology and necessity in the Generation of Animals; Conclusion.