All these general facts go to prove the close and intimate connection between crime and the aggregate of its various constituents. So that, without pursuing more detailed inquiries into certain social factors of crime, which are capable of statistical enumeration, such as the increase in the number of the police, the abundance or scarcity of corn and wine, the spread of drunkenness, family circumstances, increase of personal possessions, the facility or otherwise of the settlement of disputes, commercial and industrial crises, the rate of wages, the variation from year to year of the general conditions of existence, and so forth, coincident with the development of education, encouragements to thrift and the organisation of charity, we must now proceed to draw from these statistical data the most important conclusions of criminal sociology. <p 76> I. Criminal statistics show that crime increases in the aggregate, with more or less notable oscillations from year to year, rising or falling in successive waves. Thus it is evident that the level of criminality in any one year is determined by the different conditions of the physical and social environment, combined with the hereditary tendencies and occasional impulses of the individual, in obedience to a law which I have called, in analogy with chemical phenomena, _the law of criminal saturation_. Just as in a given volume of water, at a given temperature, we find a solution of a fixed quantity of any chemical substance, not an atom more or less, so in a given social environment, in certain defined physical conditions of the individual, we find the commission of a fixed number of crimes.