ARTS AND SCIENCES AND SOCIAL MILIEU 699 The consensus on this point between the victorious advocates of the case for the Moderns and their discomfited opponents might have been expected to have settled this question, at least, definitively. Yet, between the close of this seventeenth-century Kulturkampf and the time at which this Study was being written, some 250 years later, the con- troversy over this issue had been reopened again from two sides. On the one side Oswald Spengler, in a work published on the morrow of the War of A.D. 1914-18, had put forward the thesis that Mathematics, Natural Science, and Technology, notwithstanding their proud preten- sions to be objective, were in fact just as much at the mercy of the influences and exigencies of diverse social milieux as any activities in the realm of social human affairs.1 On the other hand, Shelley2 had won Bury's applause3 for having resuscitated a suggestion—thrown out tenta- tively, in the course of the seventeenth-century debate, by Charles Perrault, but not taken up by such circumspect advocates of the Moderns* cause as Fontenelle and Wotton—that the Fine Arts did, after all, progressively improve in the same fashion as Mathematics, Science, and Technology. Spengler's thesis was enunciated by its author in characteristically dogmatic language: 'There is not and cannot be any such thing as Number-in-Itself. There is a plurality of worlds of numbers because there is a plurality of civiliza- tions. . . . The notion of a universally valid Science which is true for all civilizations is an illusion.'* The grain of truth in these misleadingly unqualified statements is the fact that each particular historical way of life or culture is in some sense a whole whose parts are sensitively and subtly interdependent. This truth has presented itself to us forcibly in our study of encounters between societies that are one anothers* contemporaries.5 We have found that, when some single element in one culture is modified by the impact of another culture, the effects of this modification of the assaulted culture in one point are apt to spread through the entire body social and to make themselves felt at points which might seem, at first sight, to have no connexion with the point in which the change has been introduced first. This intimate interdependence has proved, in the light of such con- vincing evidence, to be so characteristic a feature of the structure of Human Society that it would indeed be surprising if one particular group of activities, represented by Mathematics, Natural Science, and Technology, should turn out to be entirely unaffected by a tendency that appears to be one of the general 'laws' of social life; and we may find ourselves able to come to an understanding with Spengler when we catch him slipping out of his pontifical vestments and condescending to explain to us that the distinctive quality of each individual civilization, on which he has been insisting, is to be interpreted, not as an absolute 1 See the passage quoted in III. iii. 380-2. 2 In his Introduction to The Revolt of Islam, 3 In The Idea of Progress, p. 124, . + Spengler, O.: Der Untergang des Abendlandes, vol. i (Munich 1920, Beck), pp. 85 and 532, quoted in this Study ibid. * See IX. viii, passim.