"Anatomy and physiology, like some aspects of chemistry, were by-products of Hindu medicine. As far back as the sixth century B.C. Hindu physicians described ligaments, sutures, lymphatics, nerve plexus, fascia, adipose and vascular tissues, mucous and synovial membranes, and many more muscles than any modern cadaver is able to show. The doctors of pre-Christian India shared Aristotle’s mistaken conception of the heart as the seat and organ of consciousness, and supposed that the nerves ascended to and descended from the heart. But they understood remarkably well the processes of digestion—the different functions of the gastric juices, the conversion of chyme into chyle, and of this into blood. Anticipating Weismann by 2400 years, Atreya (ca. 500 B.C.) held that the parental seed is independent of the parent’s body, and contains in itself, in miniature, the whole parental organism. Examination for virility was recommended as a prerequisite for marriage in men; and the Code of Manu warned against marrying mates affected with tuberculosis, epilepsy, leprosy, chronic dyspepsia, piles, or loquacity. Birth control in the latest theological fashion was suggested by the Hindu medical schools of 500 B.C. in the theory that during twelve days of the menstrual cycle impregnation is impossible. Fœtal development was described with considerable accuracy; it was noted that the sex of the fœtus remains for a time undetermined, and it was claimed that in some cases the sex of the embryo could be influenced by food or drugs."