The popularity of the ontological theory of realism, which has included so many philosophers of major as well as of minor importance, leads to speculations concerning the historical occasions which have prompted its revival. For a long while, realism has been a term so much abused that it might be well to define the particular meaning to be employed here. Realism is the doctrine that universals and values have their being independent of knowing subjects, of the whole knowledge relation, and of all other actuality. Among recent adherents to the doctrine designated as realism' may be included the names of the British realists: Whitehead, S. Alexander, the early Bertrand Russell, G. E. Moore, G. Dawes Hicks, and John Laird; the Americans Peirce, W. M. Urban, and P. Jordan, among others; and the German, Nicolai Hartmann. I shall for present purposes also include as realists those who deny the independent status for values while admitting it for universals, thus allowing the inclusion of the American neo-realists, although the justification for such a broadening of the definition is questionable. But this by no means exhausts the list of realists. They are to be found among physical scientists, as for instance, Max Planck; among pure mathematicians, as for instance, G. H. Hardy; and among symbolic logicians, as for instance, George Boole; and in many other fields. Realism is an ancient doctrine, having been part of the classical Chinese and Indian philosophy as well as of the philosophy of the classic Greeks and the scholastics. It is the thesis of this paper that while Plato's influence, to say nothing of that of Duns Scotus, has undoubtedly been a general factor in the revival of realism in modern times, a more specific occasion for its vogue in modern Britain and America can be discovered in the development of European philosophy. The metaphysical influences of the Renaissance and Reformation were the results of a late medieval tendency toward nominalism, not merely carried forward in abstract form from the views of Roseellinus and Ockham,
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