In the Vedas may be traced the progression of the distance between the priests and the warriors, at first slight, and then increasing more and more. The division of functions did not stop there. While the sacrificing priest was consecrating himself more exclusively day by day to the accomplishment of the sacred rites and to the composition of hymns; while the warrior passed his days in adventurous expeditions or daring feats, what would have become of the land and what would it have produced if others had not applied themselves without ceasing, to cultivate it? A third class became distinct, the agriculturists. In one of the last hymns of Rig Veda these three classes appear, absolutely separated and already designated by the three words Brahmans, Kchatryas, Vaisyas. The fourth class, that of the Sudras, was to arise later and to include the mass of conquered peoples when the latter joined the circle of Aryan civilization. The classes, hitherto mingling, now became rigidly separated castes. The most important of these divisions, and that which was first formed, was the one between the priests and the warriors. The Brahmans, intermediaries between men and the gods, soon became more and more exacting, and finally considered themselves as entirely superior beings and were accepted as such. The distinction between the warriors and the agriculturists also soon became marked, arising doubtless rather from a difference in fortune than in functions. The war chief, who returned laden with booty, covered himself with rings of gold, rich vestments, and gleaming arms. He became "rajah," that is to say "shining," for such was the meaning of the word at the Vedic epoch. Still no absolute barrier between the classes had arisen. They mingled to offer sacrifices, and sometimes ate in common. Heredity of office and profession began to be established. The sacred songs were handed down in families, as were also the functions of the sacrificers. And here among the Vedic Aryans are seen in process of elaboration the germs of the institution which later gained so much power in India and which dominates it still with apparent immutability. The system of castes has been the corner-stone of all the institutions of India for two thousand years. Such is its importance, and so generally is it misunderstood, that it will be well briefly to explain its origins, sources, and consequences. A system, the result of which is to permit a handful of Europeans to hold sway over two hundred and fifty millions of men deserves the attention of the observer.