The question, therefore, must be asked in a relative sense altogether, and we must inquire which of the three kinds of natural causes of crime has a <p 57>greater or less influence in determining each particular crime at any given moment in the individual and social life. No clear answer of general application can be given to this question, for the relative influence of the anthropological, physical, and social conditions varies with the psychological and social characteristics of each offence against the law. For instance, if we consider the three great classes of crimes against the person, against property, and against personal purity, it is evident that each class of determining causes, but especially the biological and social conditions, have a distinctly different influence in evolving homicide, theft, or indecent assaults. And so it is in every category of crimes. The undeniable influence of social conditions, and still more of economic conditions, in leading up to the commission of theft, is far inferior in the genesis of homicides and indecent assaults. And similarly, in each category of crimes, the influence of the determining conditions varies greatly according to the special forms of crime. Certain casual homicides are plainly the result of social conditions (gambling, drink, public opinion, &c.) in a much higher degree than homicides which for the most part spring from brutality, from the moral insensibility of individuals, or from their psycho-pathological conditions, corresponding to abnormal organic conditions. In like manner, certain indecent assaults, incests, &c., are largely the outcome of social environment, which, condemning a number of persons to live in <p 58>hovels without air or light, with a promiscuity of sex between parents and children such as obtains amongst the brutes, effaces or deadens all normal sense of modesty. On the other hand, there are cases of rape and the like which are mostly due to the biological condition of the individual, either in manifest forms of sexual disease or, less manifest though none the less actual, of biological anomaly. For thefts, again, whilst occasional simple thefts are largely the effect of social and economical conditions, this influence becomes feebler in comparison with impulses due to the personal constitution, organic and psychical, as, for instance, in the case of thefts with violence, and especially of murder for the purpose of robbery, which scoundrels of the ``swell-mob'' so frequently commit in cold blood.