and the anatomy and processes of sex, suitable to the individual. To achieve "depolarisation," there is nothing more efficacious than the frankness and explicitness of scientific statement, however elementary. Later a little knowledge of Botany and Zoology will enable a parent to sketch briefly the outlines of fertilisation and reproduction. The child may grasp the conception that the life of all individual plants and animals is directed towards the single aim of continuing the species. He can be told how the bee carries the male pollen to the female flower, how all living things habitually conjugate, the lowest in the scale of development as well as the highest, and how the fertilised egg becomes the embryo which is hatched by the mother or born of her. As the child grows older and understands more and more of these natural processes an opportunity can be used to make the presentation of the subject more personal. He can be told that during childhood his own sexual processes have been undeveloped, but that as he grows older they will awake. That with their awakening in adolescence new temptations to self-indulgence in thought or action may assail him, but that these temptations are delayed by the wisdom of Nature until his understanding has grown and his man's strength of character has developed. A high ideal of purity should be set before boy and girl alike, and the conception of sex from the beginning should be associated in their minds with the high purpose to which some day it may be put. Before the boy goes to a boarding-school he should have imbibed from his father the desire for moral cleanliness, the knowledge of good and of evil, and a cordial dislike for everything that is sensual, self-indulgent, or nasty. Talks on such subjects should be very infrequent, but I believe that, if "depolarisation" is to be achieved, they must be repeated every now and then during later childhood and in adolescence. To attempt to impart all this interesting information in a single constrained and awkward interview is to court failure, or at least to run the risk that the explanation is not fully understood, so that the child is mystified, or even offended in his sense of propriety. I have dwelt at some length upon this question of sex education, because it is one of especial difficulty when we have to deal with a child of nervous inheritance, or with a child in whom symptoms of neurosis have developed in a faulty home environment. Misconduct in sexual matters is a sign of deficient nervous and moral control, and when the conduct in other respects is ill-regulated, the development of sexual processes must be watched with some anxiety. There are those who see a still more intimate relationship between errors of conduct or symptoms of neurosis in childhood and the sexual instincts.