articles from the vaginae of quite little girls. But it is an error to suppose that the hymen is frequently ruptured by practices of this kind; the rupture of the hymen is far too painful for it to be likely to be effected during masturbation. Erogenic zones, that is to say, areas of the surface of the body whose stimulation gives rise, directly or indirectly, to voluptuous sensations, are met with often in early childhood. First of all we have those parts of the genital organs mentioned in the last paragraph; secondly, other regions of the body. Thus, in some individuals, stimulation of the anal and gluteal regions gives rise to voluptuous sensations. Freud[39] maintains that voluntary retention of the faeces is utilised for this purpose, but this appears to me very doubtful. In many children, however, gentle scratching of the anal region or the buttocks, and also more powerful stimulation of the gluteal region, such as occurs in flagellation, are associated with sexual excitement. Some children, with this end in view, stimulate the anal region with the finger or with some instrument. Other erogenic zones are also at times found in children, but not often; whereas in adults such erogenic zones are numerous, but differ greatly in different individuals. In this connexion, I need merely allude to the production of voluptuous sensations by tickling the nape of the neck. Attempts have often been made to determine the comparative frequency of masturbation in the two sexes. On one point at least all writers are agreed, viz., that of boys an overwhelming majority masturbate occasionally. The only point in dispute is whether there are any exceptions. For my own part, I am confident that exceptions exist. I have received direct information on the point from leading men of science, and from others whose absolute veracity I have never had any reason to doubt. Healthy men, endowed with a normal sexual impulse, are occasionally to be found who have never masturbated at all. I go further, and believe that such persons are by no means so rare as many authorities maintain. Nevertheless, as regards the male sex, differences of opinion are, after all, not very extensive, since it is only in relation to a minority that these differences exist. But when we pass to the question of the extent of masturbation among girls, the differences become more acute. On this point also I have endeavoured to obtain exact information by means of numerous inquiries, with the following results. Among girls, masturbation is less general than it is among boys. Among those who have never masturbated during girlhood, we find women who as adults have powerful sexual impulse. On the other hand, many girls who masturbate do so very often. I believe, indeed, that cases in which masturbation is performed twice or thrice in brief succession are _relatively_ commoner among girls than they are among boys. As regards this point my own experience harmonises with that of