The medical literature relative to precocious impregnation is full of marvelous instances. Individually, many of the cases would be beyond credibility, but when instance after instance is reported by reliable authorities we must accept the possibility of their occurrence, even if we doubt the statements of some of the authorities. No less a medical celebrity than the illustrious Sir Astley Cooper remarks that on one occasion he saw a girl in Scotland, seven years old, whose pelvis was so fully developed that he was sure she could easily give birth to a child; and Warner's case of the Jewish girl three and a half years old, with a pelvis of normal width, more than substantiates this supposition. Similar examples of precocious pelvic and sexual development are on record in abundance, and nearly every medical man of experience has seen cases of infantile masturbation. The ordinary period of female maturity is astonishingly late when compared with the lower animals of the same size, particularly when viewed with cases of animal precocity on record. Berthold speaks of a kid fourteen days old which was impregnated by an adult goat, and at the usual period of gestation bore a kid, which was mature but weak, to which it gave milk in abundance, and both the mother and kid grew up strong. Compared with the above, child-bearing by women of eight is not extraordinary. The earliest case of conception that has come to the authors' notice is a quotation in one of the last century books from von Mandelslo of impregnation at six; but a careful search in the British Museum failed to confirm this statement, and, for the present, we must accept the statement as hearsay and without authority available for reference-purposes.