Phrenologists have also sought to establish a reciprocity of action between the genital organs and the cerebellum, by means of the results of castration, and also the influence which the development of the cerebellum may have on the testicles. Castration, (say they,) while it opposes the development of the sense of venery, prevents the cerebellum from gaining the size it would otherwise have attained. Observe, too, how much broader the neck in the bull is, than in the ox. They have also advanced, that if castration occurs only at a period when the cerebellum acquires its development, the genital sense may survive this operation; that, in some cases, it may reduce this organ to a state approximating atrophy; that the removal of one testicle from an animal, whatever may be its species, may produce atrophy, or some alteration in the lobe of the cerebellum, on the side opposite to the testicle removed. They have added, that the alteration of the cerebellum had caused a wasting of the testicles; and that, in the cases where one of the lobes only was disorganized, the testicle of the opposite side was alone affected. According to Gall and his disciples, the size of the cerebellum is discerned externally by the size and breadth of the nucha. They remark, that this part of the skull is generally more convex in males than in females--in entire animals, than in those who have been castrated--in early life, and in those individuals who are distinguished for their salacity, more than in those who are not susceptible to the pleasures of love. Larrey pointed out to Gall a soldier, whose antipathy to females amounted to mania: the sight of a female caused in him violent convulsions, and almost fury. Spurzheim saw a similar instance in England. Now, in both of these individuals, the cerebellum was but slightly developed. The portraits of Newton, Charles XII., and Kant, according to Gall, by the narrowness of the neck, show that the organ of which we were speaking was but slightly developed in these great men, who history states had but little relish for venereal pleasures. Dispositions diametrically opposite, on the contrary, co-exist with an enlarged volume of the brain. The following is related by Gall:--