The scientific school of criminology demonstrates that crime is a natural and social phenomenon--like insanity and suicide--determined by the abnormal, organic and psychological constitution of the delinquent and by the influences of the physical and social environment. The anthropological, physical and social factors, all, always, act concurrently in the determination of all offences, the lightest as well as the gravest--as, moreover, they do in the case of all other human actions. What varies in the case of each delinquent and each offense, is the decisive intensity of each order of factors.[16] For instance, if the case in point is an assassination committed through jealousy or hallucination, it is the anthropological factor which is the most important, although nevertheless consideration must also be paid to the physical environment and the social environment. If it is a question, on the contrary, of crimes against property or even against persons, committed by a riotous mob or induced by alcoholism, etc., it is the social environment which becomes the preponderating factor, though it is, notwithstanding, impossible to deny the influence of the physical environment and of the anthropological factor. We may repeat the same reasoning--in order to make a complete examination of the objection brought against socialism in the name of Darwinism--on the subject of the ordinary diseases; crime, moreover, is a department of human pathology. All diseases, acute or chronic, infectious or not infectious, severe or mild, are the product of the anthropological constitution of the individual and of the influence of the physical and social environment. The decisiveness of the personal conditions or of the environment varies in the various diseases; phthisis or heart disease, for instance, depend principally on the organic constitution of the individual, though it is necessary to take the influence of the environment into account; pellagra,[17] cholera, typhus, etc., on the contrary, depend principally on the physical and social conditions of the environment. And so phthisis makes its ravages even among well-to-do people, that is to say, among persons well nourished and well housed, while it is the badly nourished, that is to say, the poor, who furnish the greatest number of victims to pellagra and cholera. It is, consequently, evident that a socialist regime of collective property which shall assure to every one human conditions of existence, will largely diminish or possibly annihilate--aided by the scientific discoveries and improvement in hygienic measures--the diseases which are principally caused by the conditions of the environment, that is to say by insufficient nourishment or by the want of protection from inclemency of the weather; but we shall not witness the disappearance of the diseases due to traumatic injuries, imprudence, pulmonary affections, etc.