Erection of the penis, with or without pollutions, has several times been noticed as a symptom of apoplexy of the cerebellum. This phenomenon may have been observed in some cases of this affection which we have cited. Serres was the first one to call attention to this phenomenon, in his Memoir on Apoplexy of the Cerebellum, inserted in the Journal of Experimental Physiology; the principal facts of which have been adduced in his work on the comparative anatomy of the brain. One fact is, that of a man, forty-six years old, who died with violent apoplexy of the cerebellum, during which satyriasis and ejaculation appeared, with swelling of all the genital organs. Similar cases, which it is unnecessary to state here, might be added. One of them was observed by Falret. “The priapism was presented to my observation with a very remarkable circumstance. The patient had been affected with apoplexy, and presented a complete paralysis of the left side of the body. Different nervous symptoms indicated that there was also great irritation of the encephalon or its membranes. This man, although half frantic, made amorous proposals to the female who attended him, and presented a semi-erection of the penis: this part, instead of being straight, presented a concavity, which looked towards the side not paralyzed. I regret that I could not examine the cadaver of this individual. The affection of the genital organs, in apoplexies of the cerebellum, might probably have been noticed in many cases, if it had been sought after.” It has not been noted, in any of the cases analyzed by Andral. Cruvelhier, also, has never noticed priapism, in a case of apoplexy of the cerebellum which he has seen; but he adds, that he would not dare to say that it has never existed--at least, temporarily. In fact, it may easily escape observation. Hydrocephalic patients often show a great passion for venereal indulgences. Gall, in noticing this remark, observes, that of all the parts of the encephalon, this is the least changed in these individuals. Chauffard has seen a hydrocephalic patient, fourteen to fifteen years old, with an enormous head, who was addicted to masturbation, and spoke of the pleasures he derived from it.