Sometimes the manifestations thus appearing in schools or wherever youths are congregated together are not truly homosexual, but exhibit a more or less brutal or even sadistic perversion of the immature sexual instinct. This may be illustrated by the following narrative concerning a large London city warehouse: "A youth left my class at the age of 16½," writes a correspondent, "to take up an apprenticeship in a large wholesale firm in G---- Street. Fortunately he went on probation of three weeks before articling. He came to me at the end of the first week asking me to intercede with his mother (he had no father) not to let him return. He told me that almost nightly, and especially when new fellows came, the youths in his dormitory (eleven in number) would waylay him, hold him down, and rub his parts to the tune of some comic song or dance-music. The boy who could choose the fastest time had the privilege of performing the operation, and most had to be the victim in turn unless new boys entered, when they would sometimes be subjected to this for a week. This boy, having been brought up strictly, was shocked, dazed, and alarmed; but they stopped him from calling out, and he dared not report it. Most boys entered direct on their apprenticeship without probation, and had no chance to get out. I procured the boy's release from the place and gave the manager to understand what went on." In such a case as this it has usually happened that a strong boy of brutal and perverse instincts and some force of character initiates proceedings which the others either fall into with complacency or are too weak to resist. Max Dessoir[127] came to the conclusion that "an undifferentiated sexual feeling is normal, on the average, during the first years of puberty,--i.e., from 13 to 15 in boys and from 12 to 14 in girls,--while in later years it must be regarded as pathological." He added very truly that in this early period the sexual emotion has not become centered in the sexual organs. This latter fact is certainly far too often forgotten by grown-up persons who suspect the idealized passion of boys and girls of a physical side which children have often no suspicion of, and would view with repulsion and horror. How far the sexual instinct may be said to be undifferentiated in early puberty as regards sex is a little doubtful. It is comparatively undifferentiated, but except in rare cases it is not absolutely undifferentiated.