But I must still add, what brings me back to my point, that even if the proposition were proved, it would not establish the conclusion. It may be, that races of abnormal intellectual development are at a disadvantage in the struggle for existence. That does not prove that "progress is not primarily intellectual". Buckle, who argued that progress was due to intellectual causes exclusively, always assumed that human nature was constant, or that the faculties did not change. Though I do not accept his view, any more than Mr. Kidd's, I do not see that he was inconsistent. I take the most obvious case to illustrate the point. No one can doubt that one of the most important influences in modern social evolution was the set of mechanical contrivances devised by Arkwright and Watt and their contemporaries. Without them, the enormous development of great cities, of a population of artisans, and of the bringing together of all quarters of the globe, would have been impossible. The inventions, again, were due to no moral purpose in the inventors. They wanted to make money, and represented what is called (I do not say justly) the most egoistic impulse of modern times. One condition, then, of the great social change was essentially intellectual. This does not mean that Watt was a cleverer man than Archimedes. I don't know whether he was or not; but it does mean that the mechanical sciences had improved; and, consequently, that Watt, though not possessed of intrinsically greater powers, was, in this direction, a more intellectual person. He had inherited the truths discovered by Archimedes and many generations of successors. That science should be efficient, it is not required that men should be greater geniuses than their predecessors; but simply that they should know more of the facts and laws of nature, and have, so to speak, better intellectual tools. Mr. Kidd thinks that the inability of a savage to count three does not prove him to be stupid, only to be without certain rules discovered by the higher races. Yet, he will not deny that by the help of arithmetic we can work out sums inconceivable to the savage; and that our power affects our whole social position. Does not the existence of a currency affect mankind; and if we could not count, could we make use of it?