As a slight contribution toward the question, I have selected a series of 12 cases of women of whose sexual development I possess precise information, with the following results: In 2 cases distinct sexual feeling was experienced spontaneously at the age of 7 and 8, but the complete orgasm only occurred some years after puberty; in 5 cases sexual feeling appeared spontaneously for a few months to a year after the appearance of menstruation, which began between 12 and 14 years of age, usually at 13; in another case sexual feeling first appeared shortly after menstruation began, but not spontaneously, being called out by a lover's advances; in the remaining 4 cases sexual emotion never became definite and conscious until adult life (the ages being 26, 27, 34, 35), in 2 cases through being made love to, and in 2 cases through self-manipulation out of accident or curiosity. It is noteworthy that the sexual feelings first developed in adult life were usually as strong as those arising at puberty. It may be added that, of these 12 women, 9 had at some time or another masturbated (4 shortly after puberty, 5 in adult life), but, except in 1 case, rarely and at intervals. All belong to the middle class, 2 or 3 leading easy, though not idle, lives, while all the others are engaged in professional or other avocations often involving severe labor. They differ widely in character and mental ability; but, while 2 or 3 might be regarded as slightly abnormal, they are all fairly healthy. I am inclined to believe that the experiences of the foregoing group are fairly typical of the social class to which they belong. I may, however, bring forward another series of 35 women, varying in age from 18 to 40 (with 2 exceptions all over 25), and in every respect comparable with the smaller group, but concerning whom my knowledge, though reliable, is usually less precise and detailed. In this group 5 state that they have never experienced sexual emotion, these being all unmarried and leading strictly chaste lives; in 18 cases the sexual impulse may be described as strong, or is so considered by the subject herself; in 9 cases it is only moderate; in 3 it is very slight when evoked, and with difficulty evoked, in 1 of these only appearing two years after marriage, in another the exhaustion and worry of household cares being assigned for its comparative absence. It is noteworthy that all the more highly intelligent, energetic women in the series appear in the group of those with strong sexual emotions, and also that severe mental and physical labor, even when cultivated for this purpose, has usually had little or no influence in relieving sexual emotion. An American physician in the State of Connecticut sends me the following notes concerning a series of 13 married women, taken, as they occurred, in obstetric practice. They are in every way respectable and moral women:--