Now it is one of these basic racial lines of cleavage which runs between "East" and "West." Broadly speaking, the Near and Middle East is the "brown world," and this differentiates it from the "white world" of the West in a way which never can be really obliterated. Indeed, to attempt to obliterate the difference by racial fusion would be the maddest of follies. East and West can mutually quicken each other by a mutual exchange of ideas and ideals. They can only harm each other by transfusions of blood. To unite physically would be the greatest of disasters. East and West have both given much to the world in the past, and promise to give more in the future. But whatever of true value they are to give can be given only on condition that they remain essentially themselves. Ethnic fusion would destroy both their race-souls and would result in a dreary mongrelization from which would issue nothing but degeneration and decay. Both East and West instinctively recognize the truth of this, and show it by their common contempt for the "Eurasian"--the mongrel offspring of unions between the two races. As Meredith Townsend well says: "The chasm between the brown man and the white is unfathomable, has existed in all ages, and exists still everywhere. No white man marries a brown wife, no brown man marries a white wife, without an inner sense of having been false to some unintelligible but irresistible command."[107] The above summary of the political, economic, social, and racial differences between East and West gives us a fair idea of the numerous cross-currents which complicate the relations of the two worlds and which hinder Westernization. The Westernizing process is assuredly going on, and in subsequent chapters we shall see how far-reaching is its scope. But the factors just considered will indicate the possibilities of reaction and will roughly assign the limits to which Westernization may ultimately extend. One thing is certain: Western political control in the Orient, however prolonged and however imposing in appearance, must ever rest on essentially fragile foundations. The Western rulers will always remain an alien caste; tolerated, even respected, perhaps, but never loved and never regarded as anything but foreigners. Furthermore, Western rule must necessarily become more precarious with the increasing enlightenment of the subject peoples, so that the acquiescence of one generation may be followed by the hostile protest of the next. It is indeed an unstable equilibrium, hard to maintain and easily upset.