Careful investigations would doubtless furnish additional examples of this comical application of the _argumentum ad hominem_ in refutation of the notion that intellectual capacity is determined by the bulk of the brain or the shape of the skull. Ugo Foscolo, one of the most celebrated of modern Italian poets, had a cranium, which, according to this standard of appreciation, ought to have belonged to an idiot. On the other hand, the brain of the “Hottentot Venus,” examined by Gratiolet, far surpassed in the symmetry of both hemispheres and the perfection of its circumvolutions the normal brains of the Caucasian race. The same phenomenon has been observed, although in a less striking manner, occasionally in cretins and quite often in criminals. Character is the resultant of a multitude of combined forces, the great majority of which are still unknown and perhaps unknowable quantities. The impulse given by each must be exactly estimated in order to predetermine the joint effect. No factor which contributes to its formation must be overlooked, and the acceptance of any one of them, however important it may seem to be, as the basis on which to reform and reconstruct our penal legislation, would be premature and pernicious. This hobby-horsical tendency, which is the vice of every specialist, is now the besetting sin of criminal anthropologists, each of whom is firmly convinced that he can reach the goal only on his own garran.