Unifying, Jacobin artificiality corresponds to the metaphysics of individualism, just as the conception of national and international federalism corresponds to the scientific character of modern socialism. The organism of a mammal is simply a federation of tissues, organs and anatomical machinery; the organism of a society can consist of nothing but a federation of communes, provinces and regions; the organism of humanity can be nothing but a federation of nations. If it is absurd to conceive of a mammal whose head should have to move in the same fashion as the extremities and all of whose extremities would have to perform the same motions simultaneously, there is no less absurdity in a political and administrative organization in which the extreme northern province or the mountainous province, for instance, have to have the same bureaucratic machinery, the same body of laws, the same methods, etc., as the extreme southern province or the province made up of plains, solely through the passion for symmetrical uniformity, that pathological expression of unity. If we disregard those considerations of a political order which make it possible to conclude, as I have done elsewhere,[35] that the only possible organization for Italy, as for every other country, appeared to me to be that of an administrative federalism combined with political unity, we can regard it as manifest, that at the close of the nineteenth century the individual, as an independent entity, is dethroned alike in biology and sociology. The individual exists, but only in so far as he forms a part of a social aggregate. Robinson Crusoe--that perfect type of individualism--can not possibly be aught but a legend or a pathological specimen. The species--that is to say, the social aggregate--is the great, the living and eternal reality of life, as has been demonstrated by Darwinism and confirmed by all the inductive sciences from astronomy to sociology. At the close of the eighteenth century Rousseau thought that the individual alone existed, and that society was an artificial product of the "social contract" and, as he attributed (just as Aristotle had done in the case of slavery) a permanent human character to the transitory manifestations of the period, such as the rottenness of the regime under which he lived, he further thought that Society was the cause of all evils, and that individuals are all born good and equal. At the end of the nineteenth century, on the contrary, all the inductive sciences agree in recognizing that society, the social aggregate, is a fact of Nature, inseparable from life, in the vegetable species as in the animal species, from the lowest "animal colonies" of zoophytes up to societies of mammals (herbivora), and to human society.[36]