women even in waking life. In men it is probably extremely rare. The erotic dream seems to differ flagrantly from the vesical dream, in that it occurs in adult life, and is with difficulty brought under control. The contrast is, however, very superficial. When we remember that sexual activity only begins normally at puberty, we realize that the youth of twenty is, in the matter of sexual control, scarcely much older than in the matter of vesical control he was at the age of six. Moreover, if we were habitually, from our earliest years, to go to bed with a full bladder, as the chaste man goes to bed with unrelieved sexual system, it would be fully as difficult to gain vesical control during sleep as it now is to gain sexual control. Ultimately, such sexual control is attained; after the age of forty, it seems that erotic dreams with emission become more and more rare; either the dream occurs without actual emission, exactly as dreams of urination occur in adults with full bladder, or else the organic stress, with or without dreams, serves to awaken the sleeper before any emission has occurred. But this stage is not easily or completely attained. St. Augustine, even at the period when he wrote his _Confessions_, mentions, as a matter of course, that sexual dreams "not merely arouse pleasure, but gain the consent of the will." (X. 41.) Not infrequently there is a struggle in sleep, just as the hypnotic subject may resist suggestions; thus, a lady of thirty-five dreamed a sexual dream, and awoke without excitement; again she fell asleep, and had another dream of sexual character, but resisted the tendency to excitement, and again awoke; finally, she fell asleep and had a third sexual dream, which was this time accompanied by the orgasm. (This has recently been described also by Näcke, who terms it _pollutio interrupta, Neurologisches Centralblatt_, Oct. 16, 1909; the corresponding voluntary process in the waking state is described by Rohleder and termed _masturbatio interrupta, Zeitschrift für Sexualwissenschaft_, Aug., 1908.) The factors involved in the acquirement of vesical and sexual control during sleep are the same, but the conditions are somewhat different.