AGE OF FIRST MENSTRUATION IN MOTHERS AND DAUGHTERS

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Abstract
The age of women at the first menses is one of the criteria of normal development. Numerous articles have been written reporting statistics on the subject, for many countries and races. The material dealt with herein was collected with the purpose of comparing two successive generations of the same family in this respect. We had hoped to secure histories showing contrasting environmental conditions in the two generations. When the material was in, however, it proved to be from families in which the mothers and daughters remained, for the most part, in the same or similar climatic and social environments. These families are not only overwhelmingly Southern in both generations but pretty definitely localized in Louisiana and the contiguous states, so that the investigation narrowed down to a study of the two generations living under much the same physical conditions. The data demonstrate that there is an acceleration of development in

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