A case is on record of an infant who menstruated at the age of six months, and whose menses returned on the twenty-eighth day exactly.

Clark, Wall, and the Lancet give descriptions of cases at the ninth month.

Naegele has seen a case at the eighteenth month, and Schmidt and Colly in the second year.

Another case is that of a child, nineteen months old, whose breasts and external genitals were fully developed, although the child had shown no sexual desire, and did not exceed other children of the same age in intellectual development.

This prodigy was symmetrically formed and of pleasant appearance.