Even more manifestly may Japanese architectural development be traced to the social heredity derived from China and India. The needs of the developing internal civilization have determined its external manifestation. So far as Japanese differs from Chinese architecture, it may be attributed to Japan's isolation, to the different demands of her social order, to the difference of accessible building materials, and to the different social heredity handed down from prehistoric times. That the distinguishing characteristics of Japanese architecture are due to the inherent race nature cannot for a moment be admitted. We conclude that the Japanese are not possessed of a unique and inherent æsthetic taste. In some respects they are as certainly ahead of the Occidental as they are behind him in other respects. But this, too, is a matter of social development and social heredity, rather than of inherent race character, of brain structure. If æsthetic nature were a matter of inherited brain structure, it would be impossible to account for rapid fluctuations in æsthetic judgment, for the great inequality of æsthetic development in the different departments of life, or for the ease of acquiring the æsthetic development of alien races.[X] XVI MEMORY--IMITATION The differences which separate the Oriental from the Occidental mind are infinitesimal as compared with the likenesses which unite them. This is a fact that needs to be emphasized, for many writers on Japan seem to ignore it. They marvel at the differences. The real marvel is that the differences are so few and so superficial. The Japanese are a race whose ancestors were separated from their early home nearly three thousand years ago; during this period they have been absolutely prevented from intermarriage with the parent stock. Furthermore, that original stock was not the Indo-European race. And no one has ventured to suggest how long before the migration of the ancestors of the Japanese to Japan their ancestors parted from those who finally became the progenitors of modern Occidental peoples. For thousands of years, certainly, the Japanese and Anglo-Saxon races have had no ancestry in common. Yet so similar is the entire structure and working of their minds that the psychological textbooks of the Anglo-Saxon are adopted and perfectly understood by competent psychological students among the Japanese. I once asked a professor of psychology in the Matsuyama Normal School if he had no difficulty in teaching his classes the psychological system of Anglo-Saxon thinkers, if there were not peculiarities of the Anglo-Saxon mind which a Japanese could not understand, and if there were not psychological phenomena of the Japanese mind which were ignored in Anglo-Saxon psychological text-books. The very questions surprised him; to each he gave a negative reply. The mental differences that characterize races so dissimilar as the Japanese and the Anglo-Saxon, I venture to repeat,