One of the facts which I always tried to elicit from boys was the source of their information, or rather the character of that source, for I was naturally anxious not to ask a boy to incriminate any individual known to me. In many cases, information came first to the boy at _home_ from a brother, or cousin, or casual acquaintance, or domestic servant. In one of the worst cases I have known the information was given to a boy by another boy--an entire stranger to him--whom he happened to meet on a country road when cycling. Since boys meet one another very much more at school than elsewhere and spend three-fourths of their lives there, of course information is more often obtained at school than at home. My own experience leads me to think that in this respect the day-school--probably on account of its mixed social conditions--is worse than the boarding-school. Before passing from matters of personal experience, it may interest the reader if I give particulars of a few typical cases to illustrate some points on which I have insisted. _Case A._--The father and mother of a boy close on thirteen came to see me before entering the lad. They had no idea that I was specially interested in purity-teaching; but they were anxious to ascertain what precautions we took against the corruption of small boys. They struck me as very good parents. I was specially pleased that they were alive to the dangers of impurity, and that the mother could advert openly to the matter without embarrassment. I advised them to give the boy explicit warning; but they said that they were anxious to preserve his innocence as long as possible. He was at present absolutely simple, and they hoped that he would long remain so. It was a comfort to them that I was interested in the subject, and they would leave the boy with confidence in my care. As soon as I saw the boy, I found it difficult to believe in his innocence; and I soon discovered that he was thoroughly corrupt. Not merely did he begin almost at once to corrupt other boys, but he actually gave them his views on brothels! In a private interview with me he admitted all this, and told me that he was corrupted at ten years of age, when he was sent, after convalescence from scarlet fever, to a country village for three months. There he seems to have associated with a group of street boys, who gave him such information as they had, and initiated him into self-abuse. Since then he had been greedily seeking further information and passing it on.