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 new ideal was substituted for the old ideal based on theological propositions. It inspired the English Utilitarian philosophers (Bentham, James Mill, J. S. Mill, Grote) who preached the greatest happiness of the greatest number as the supreme object of action and the basis of morality. This ideal was powerfully reinforced by the doctrine of historical progress, which was started in France (1750) by Turgot, who made progress the organic principle of history. It was developed by Condorcet (1793), and put forward by Priestley in England. The idea was seized upon by the French socialistic philosophers, Saint-Simon and Fourier. The optimism of Fourier went so far as to anticipate the time when the sea would be turned by man's ingenuity into lemonade, when there would be 37 million poets as great as Homer, 37 million writers as great as Molière, 37 million men of science equal to Newton. But it was Comte who gave the doctrine weight and power. His social philosophy and his religion of Humanity are based upon it. The triumphs of science endorsed it; it has been associated with, though it is not necessarily implied in, the scientific theory of evolution; and it is perhaps fair to say that it has been the guiding spiritual force of the nineteenth century. It has