As may be imagined, not very much money is made in transactions exactly of this kind--the one cited is taken only because it illustrates the principle. For whether the banker sends over in every mail a bewildering assortment of every conceivable form of foreign exchange to be credited to his account abroad, or whether he confines himself to remittances of the simplest kind of bills, the idea remains exactly the same--he is depositing money to the credit of his account in order that he may have a balance on which he can draw. That is, indeed, the sum and substance of the exchange business of the foreign department of most banking houses--the maintaining of deposit accounts in banks at foreign centres on which deposit account the bank here is in a position to draw according to the wants and needs of its customers. II. SELLING CABLES AGAINST DEMAND EXCHANGE A "cable," so-called, differs from a sight draft only in that the banker abroad who is to pay out the money is advised to do so by means of a telegraphic message instead of by a bit of paper instructing him to "pay to the order of so and so." Under ordinary circumstances foreign exchange dealers who engage in the business of selling cables carry adequate balances on the other side, balances which they keep replenishing by continuous remittances of demand exchange. III. SELLING "DEMAND" BILLS AGAINST REMITTANCES OF LONG BILLS If there is a stock operation in the conduct of a foreign exchange business it is the selling by bankers of their demand bills of exchange against remittances of commercial and bankers' long paper. Bills of the latter class make up the bulk of foreign exchange traded in, and its disposal naturally is the most important phase of foreign exchange business. What the foreign exchange business really is grounded on is the existence of commercial bills called into existence by exports of merchandise. Buying and remitting commercial long bills is no pastime for an inexperienced man. Entirely aside from the question of rate, and profit on the exchange end of the transaction, there must be taken into consideration the matter of the credit of the drawer and the drawee, the salability of the merchandise specified in the bill of lading, and a number of other important points.