Banking is a species of insurance; it is theoretically possible that a banker may be called upon to pay all his deposits at once, just as it is theoretically possible that all the lives insured in an office may end at the same instant; or it is theoretically possible that all the houses insured may be burned at the same hour. The depositors and noteholders of the Bank of England could demand payment the same day. All the depositors and noteholders of the Bank of France could demand payment the same day. All the depositors of any bank could demand payment the same day. But all banking, as well as all insurance, is based upon the expectation that these contingencies will not happen, and the average experience of life proves that they do not happen. A banker multiplies his debts to be paid on demand and keeps buying a sufficient amount of cash to insure the immediate payment of all claims which are _likely_ to be demanded at one time. If a pressure comes upon him he must sell some of the securities he has bought, or borrow money on them. When the customer discounts a note at his bank he parts with the property in it, just as when he sells any other article. The note becomes the absolute property of the banker and he may sell it again, or pledge it, or deal with it in any way that suits his own interests best. The notes in the safe of a banker are exactly similar to the goods in the shop of a retail dealer. The retail dealer buys the goods from the wholesale dealer and sells them at a higher price to his customers; and, as he makes a profit by doing so, the goods are _capital_ to him. Notes likewise are goods, or merchandise, which the bank buys from its own depositors at a discount, or bearing interest for a time, and as the bank makes a profit by so doing, the notes are _capital_ to the bank precisely in the same way that the goods in the shop of the retail dealer are _capital_. Now, lest we shall be misled, I want to call your attention to an error which is very common. Many persons not being aware that the word "_Deposit_" in banking language means the credit created in exchange for money, checks, drafts or notes bought, when they hear or read that a bank has such an amount of deposits conceive or suppose that the bank has that amount of cash on hand to trade with.