There are, of course, many other psychological influences to which attention must also be directed. One of the most important of these is the avoidance of psychical contagion. A boy who is sexually premature, or in whom some other striking sexual manifestations have occurred, may exercise an extremely harmful influence upon other children. We must endeavour to remove such a boy from the companionship of others, and in this country this often can be effected through the instrumentality of the Law of Guardianship (_Fuersorgegesetz_). But it will by no means always be easy to find the guilty person. It is extremely common for such an abnormal child to set the tone for the others; and such a child may be making remarkable progress in study, although its sexual and moral level is a very low one. A number of other measures will be inferred from what has been said in the section on etiology. These are social rather than medical problems. We must avoid letting children have the chance of seeing others engaged in sexual intercourse; they must not live in too close and intimate an association with other children; they must not grow up in the society of prostitutes; children who are past infancy should not share a common bed. As regards school-life, it is supposed to be a matter of great importance that there should be separate closets for the two sexes. I am myself doubtful if this last matter is one of much moment. In any case, we can interfere for the special protection of children who have been exposed to peculiar risks, and have for this reason been led astray sexually. I have seen children who have been taught sexual misconduct, either by a nursemaid or by other children, and have practised such misconduct for a time; but in whom a complete cure has resulted from separation from the seducer. In some cases, of course, it will be necessary to do more than this, and to subject the child to some special treatment; and in rare instances, in which the sphere of the sexual is already markedly developed, it may be necessary that this treatment should be institutional. But such cases are certainly very uncommon. A matter of importance is that the parents or other persons responsible for the care and guidance of the child, should understand the psychical management of children; for example, that they should not fall into the common error of regarding the love-affairs of children as a joke, and that they should not, by this attitude, actually encourage the children in their course of conduct.