It is, indeed, astonishing that the anti-socialist prejudice of M. Garofalo should have been strong enough to cause him to forget that truth which is nevertheless a legitimate induction of criminal biology and sociology, the truth that besides the congenital criminal there are other types of criminals who are more numerous and more directly produced by the vitiated social environment. And, finally, if the congenital criminal is not himself the direct product of the environment, he is indirectly its product through the degeneration begun in his ancestors, by some acute disease in some cases, but by debilitating poverty in the majority of cases, and afterward hereditarily transmitted and aggravated in accordance with the inexorable laws discovered by modern science. * * * * * M. Garofalo's book, which was announced as an assault of science upon socialism, has been, even from this point of view, a complete disappointment, as even the Italian anti-socialists have confessed in several of the most orthodox Reviews. It now remains for me to reply briefly to his observations--and they are few and far between--on the relations which exist between contemporary socialism and the general trend and tendency of thought in the exact sciences. Disregarding the arguments which I had developed on this subject by pointing out that there is an essential connection between economic and social transmutation (Marx) and the theories of biological transmutation (Darwin) and of universal transmutation (Spencer), M. Garofalo has thought it prudent to take up for consideration only "the struggle for existence" and the relations between "evolution and revolution." As to the first, five pages (96-100) are enough to enable him to declare, without supporting his declaration by any positive argument which is not merely a different verbal expression of the same idea, that the Darwinian law of the struggle for existence has not undergone and can not undergo any transformation except that which will change the violent struggle into competition (the struggle of skill and intelligence) and that this law is irreconcilable with socialism; for it necessarily requires the sacrifice of the conquered, while socialism "would guarantee to all men their material existence, so they would have no cause for anxiety." But my friend, the Baron Garofalo, quietly and completely ignores the fundamental argument that the socialists oppose to the individualist interpretation that has hitherto been given of the struggle for life and which still affects the minds of some socialists so far as to make them think that the law of the struggle for life is not true and that Darwinism is irreconcilable with socialism.