There are physiological facts and pathological conditions brought forth for our contemplation, while investigating the subject of eunuchism in all its details, that cause us to feel that, after all, the old Hippocratic principle of inductive philosophy, upon which our study and practice of medicine is founded, with rational experience and observation for its corner-stone, is, even if commonplace, the only proper avenue of knowledge. To exemplify this proposition we have in this particular subject the practical observations and experience of M. Mondat, of Montpellier; in his interesting work on "De la Sterilite de l'Homme et de la Femme," published in 1840, he details some instructive information on the subject of eunuchs, giving some explanation as to why many simply castrated eunuchs are, like the much-prized eunuchs of the Roman matrons, still able to acquit themselves of the copulative function. He mentions that while in Turkey he studied the subject in its details, and, having found some of these copulating eunuchs, he secured some of the ejaculated fluid and subjected it to a careful examination. The discharge was lacking the characteristic seminal odor; it was in other respects, to the palpation especially, very much like the seminal fluid. He found that these eunuchs were much given to venereal enjoyment, but that either legitimate intercourse or masturbation, to which many were addicted, was apt to be followed by a marasmus ending in galloping consumption. Mondat personally knew the opera-singer Velutti, who died in London; Velutti was, when a child, castrated by his parents, having both testicles removed, being intended by his father, who had himself performed the operation, for the choir of the Papal Chapel at Rome. Velutti was as much of a favorite in his day as our present tenors and handsome actors. The admiration of the opposite sex was fatal to him; he formed a _liaison_ with a young English lady residing in London, and the resulting excesses in which he indulged quickly brought him to his grave. He was passionately fond of women and was able to acquit himself perfectly; at least, as far as the copulative act--barring fecundation--was concerned.