Untold miseries arise from the pollution of the body. Self-pollution, or onanism, is one of the most prolific sources of evil, since it leads both to the degradation of body and mind. It is practiced more or less by members of both sexes, and the habit once established, is overcome with the greatest difficulty. It is the source of numerous diseases which derange the functional activity of the organs involved, and eventually impair the constitution. This vicious habit is often practiced by those who are ignorant of its dangerous results. Statistics show that insanity is frequently caused by masturbation.