General development of the idea of division into castes. Originating at first in the variety of tribes settled in one and the same country, and their different modes of life.--Its further progress in despotic and in theocratic kingdoms.--Application to Egypt and to the Egyptian caste of priests, as an original, civilized tribe. 5. The peculiarity of this caste was the worship of certain deities, the principal of which were Ammon, Osiris, and Phtha, confounded by the Greeks with their Jupiter, Bacchus, and Vulcan. The spread of this worship, which was always connected with temples, affords, therefore, the most evident vestiges of the spread of the caste itself; and those vestiges combined with the records of the Egyptians, lead us to conclude that this caste was a tribe which migrated from the south, from beyond Meroe in Ethiopia, and by the establishment of inland colonies around the temples founded by them, gradually extended and made the worship of their gods the dominant religion in Egypt. Proof of the accuracy of the above theory deduced from monuments and express testimonies concerning the origin of Thebes and Ammon from Meroe; it might have been inferred from the preservation of the worship of Ammon in the latter place. Memphis, again, and other cities in the valley of the Nile, are commonly supposed to have been founded by detachments from Thebes. 6. This conjecture, which agrees with the usual progress of population, is corroborated by the very ancient division of the country into districts, or nomes. This division was intimately connected with the chief temples, each of which represented a separate colony of the caste of priests; so that the inhabitants of every home belonged to the chief temple, and joined in the religious worship there performed. 7. To the gradual extension of this civilized tribe, which comprised, not only the caste of the priests, but certainly also that of the warriors, and perhaps some others, may be attributed the formation of several small states along the banks of the Nile; the central point of each being always such a colony as we have just now described; although each state consisted both of the aboriginal tribes of the neighbourhood, and of those that had migrated into the country. The bond which united every separate state was, therefore, as in most of those formed in the infancy of mankind, a common worship, in which all the members participated. But what, by reason of the peculiarities of soil and climate, could not take place in southern Africa, took place in Egypt: agriculture, and its progressive improvement, became the great support of civilization; and, as being the true foundation of states, formed the principal political object of the ruling caste.