Banking institutions are specialized dealers in and guarantors of credits. The evolution of our system of credit has been characterized by the same division of labor which dominates our social and economic structure. Not only have credit institutions separated from the merchant and industrial institutions, but the credit institutions have themselves specialized on the basis of function. This differentiation of functions affords the most useful classification of banks. Banks may be viewed, of course, from an economic or social point of view as well as from that of business. The economist and sociologist consider the services of the bank with reference to the furtherance of human welfare. The banker, however, thinks of his bank as a profit-making institution; he may philosophize on its economic and social influences, but unless moved by a high sense of public duty he is prone to think most of dividends. His customers, moreover, are likely to think of the bank from the purely business point of view - as an institution from which to secure loans, in which to deposit money, and by the aid of which securities may be floated and estates managed.