nocent practice and that it may be indulged in unreservedly. The principal utility of observing the diseases caused by masturbation is to determine what are the maladies produced by onanism and what is the relative frequency of each of them. We can also certainly form an opinion, from that which is shown by observation, in regard to that which escapes us. But it is only by induction, that the extent of the evils caused by venereal abuses can be estimated. The bad effects produced by these abuses, can be estimated only by considering what they may produce. It is only after studying the genital system in its relations with other organs, and considering the influence it exercises upon them, that we can pronounce in regard to the maladies and infirmities and dangers of all kinds which attend the abuse of the genital system. We proceed to this subject first. We shall then state what is known from direct observation in regard to the different affections which result from venereal excesses