If the Hindu Society were a mere federation of mutually exclusive units, the matter would be simple enough. But Caste is a parcelling of an already homogeneous unit, and the explanation of the genesis of Caste is the explanation of this process of parcelling. Before launching into our field of enquiry, it is better to advise ourselves regarding the nature of a caste. I will therefore draw upon a few of the best students of caste for their definitions of it. (1) M. Senart, a French authority, defines a caste as “a close corporation, in theory at any rate rigorously hereditary: equipped with a certain traditional and independent organisation, including a chief and a council, meeting on occasion in assemblies of more or less plenary authority and joining together at certain festivals: bound together by common occupations, which relate more particularly to marriage and to food and to questions of ceremonial pollution, and ruling its members by the exercise of jurisdiction, the extent of which varies, but which succeeds in making the authority of the community more felt by the sanction of certain penalties and, above all, by final irrevocable exclusion from the group.” (2) Mr. Nesfield defines a caste as “a class of the community which disowns any connection with any other class and can neither intermarry nor eat nor drink with any but persons of their own community.” (3) According to Sir H. Risley, “a caste may be defined as a collection of families or groups of families bearing a common name which usually denotes or is associated, with specific occupation, claiming common descent from a mythical ancestor, human or divine, professing to follow the same professional callings and are regarded by those who are competent to give an opinion as forming a single homogeneous community.” (4) Dr. Ketkar defines caste as “a social group having two characteristics: (1) membership is confined to those who are born of members and includes all persons so born; (2) the members are forbidden by an inexorable social law to marry outside the group.” To review these definitions is of great importance for our purpose. It will be noticed that taken individually the definitions of three of the writers include too much or too little: none is complete or correct by itself and all have missed the central point in the mechanism of the Caste system. Their mistake lies in trying to define caste as an isolated unit by itself, and not as a group within, and with definite relations to, the system of caste as a whole. Yet collectively all of them are complementary to one another, each one emphasising what has been obscured in the other. By way of criticism, therefore, I will take only those points common to all Castes in each of the above definitions which are regarded as peculiarities of Caste and evaluate them as such.