3. The _Vaishya_ or the merchant and husbandman class constituted the body of the people. Theoretically they were the equals of the other classes of the Aryan family; but “practically this class together with the fourth caste, namely the Sudras, formed the majority of the population, whose duty it was to support and serve the two upper classes.” They managed the business life of the country and were responsible for the maintenance of the other classes. They tilled the soil and managed the entire commercial and industrial affairs of the land. This class was again subdivided into various groups according to their profession. This classification of the middle class of India on the basis of occupation was founded upon a thorough understanding of the laws of heredity--“the purpose being to develop the best qualities through heredity transmission. Thereby an attempt was made to develop further the brain of the scholar, the skill of the craftsman, and the ingenuity of the trader through the cumulative influence of careful selection from generation to generation.” By thus shutting different trades and professions into air-tight compartments the Vaishya deprived themselves of the benefits of the infusion of young blood into the old system. While on the one hand it had the wholesome effect of reducing the evils of competition to the minimum, on the other it has gradually tended “to turn arts into crafts and genius into skill.” 4. _Sudras_ or the servant class constituted the entire aboriginal non-Aryan population of the country, whose function was to do mechanical service in the household life of the community. According to Manu the highest merit for this class was to serve faithfully the other three classes. The Sudras performed the most degrading tasks, and were allowed to come into contact with the Aryan population only as menials. On account of their filthy habits these aboriginals were not allowed a close approach to the persons of the higher classes--hence the origin of the term “untouchable.” Yet the fact stands that even the “untouchables” are members of the Hindu family group. At marriages and other festivals gifts are freely exchanged between them and the upper classes. For a householder it is equally important to participate in the ceremonies of the village “untouchables” and his own cousins. I remember very clearly how as a young boy I was instructed by my mother to bow each morning before every elder member of the family, nor forgetting the servants, or Sudras. Bhagavad Gita, the Bible of the Hindus, lays down the following rules for the different castes of India: