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 that presents such an eventful record of intercourse with foreign countries. The geography of India points to her natural isolation; but the history of India reveals other facts. And if we study that history carefully from the earliest times we shall easily recognize that contact or intercourse with other countries has been a no less potent factor in its making than isolation. It has been well said that none of the greatest movements in the world which have influenced the history of mankind have failed to touch India and contribute to the development and richness of her extraordinarily varied culture and civilization. Above all comprehension and beyond all human insight is that mysterious impulse which gave birth to the momentous movement of Aryan migration and expansion, so big with consequences, and by far the most important event in the world's history. And it is a commonplace of history that one of the main streams of this great migration of the pioneers of the world's civilization entered India through her north-western mountain passes to build up her spiritual character, even as the Indus and the Ganges have broken through the Himalayas to create her physical character. For centuries these Indo-Aryans pushed on their work of colonizing India amid struggles and conflicts with the original inhabitants of the country, and developed a civilization that is reflected in the literature they have created. Then rose Buddhism, the first of