But afterwards, when the social relations became more clearly fixed by law, and an union on a larger scale was formed by a general league, as the duties of military service were annexed to the soil, so the right to the soil was again determined by, and depended on, military service; now, in that primitive period of history, such a political union might have been formed by a common subordination to a higher power, or by a confederacy between several potentates; and this has really been the origin of an hereditary landed nobility in many countries. The hereditary continuance or transmission of arts and trades, whereby the son pursues the occupation of the father, and learns and applies what the latter has discovered, has nothing singular in itself, and appears indeed to contain its own explanation. But it is not easy, or at least equally so, to account for the exclusive distribution and the exact and rigid separation of castes, particularly by any religious motives and principles, which are, however, indubitably connected with this institution. Still less can we understand the existence of a great hereditary class of priests, eternally divided from the rest of the community, such as existed both in India and Egypt. To comprehend this strange phenomenon, we must endeavour to discover its origin, and trace it back, as far as is possible, to the primitive ages of the world.--If, for the sake of brevity, I have used the expression, "a class of _hereditary priests_," I ought to add, in order to explain my meaning more clearly, that the word _priests_ must not be taken in that limited sense which antiquity attached to it; that the Brahmins are not merely confined to the functions of prayer, but are strictly and eminently theologians, since they alone are permitted to read and interpret the Vedas, while the other castes can read only with their sanction such passages of those sacred writings as are adapted to their circumstances, and the fourth caste are entirely prohibited from hearing any portion of them. The Brahmins are also the lawyers and physicians of India, and hence the Greeks did not designate them erroneously when they termed them the _caste of philosophers_.