Herbert Spencer gives a definition of Evolution, phrased in technical terms, which might be roughly summed up in these words: A process whereby many similar and simple things become dissimilar parts of one complex thing. If we trace, for instance, the evolution of human society, we see about as follows: In the beginning man exists in widely scattered and unrelated tribes, having a very loosely organised government, each individual doing about as he pleases, and all individuals being very much the same. Each finds his own food and cooks it, makes his own weapons and clothing, and looks and thinks and acts like his neighbour. Little by little, as the tribe grows, it begins to come into contact with other tribes that also are growing, and a pressure begins; the tribes make war upon each other, and each individual of the tribe is forced by the presence of danger to unite himself more closely with his fellows, to establish a more rigid rule of obedience, and to force refractory members to the general will. Then, under still growing pressure, one tribe unites with another against a common enemy, and the strongest man in the two rules both; which process of combining continues until at last there results an organism of great complexity, whose members are no longer equal and self-sustaining, but have different activities and ranks and characteristics, and are each dependent upon the rest. If, for instance, we examine France during the Feudal period, we find numerous principalities, duchies and baronies, each one an elaborate and complex organisation, with various classes and hierarchies and tributary parts, and a whole system of laws and customs and beliefs to correspond. And no sooner is this process complete than an evolution begins among these organisms; under the stress of jealousies and ambitions they too begin to struggle, to combine; and presently in one of them arises a strong man who secures command of them all. When the process is completed, there stands in the place of a hundred principalities, one kingdom, the Kingdom of France.