“ Deposit is also used in the sense of earnest or security for the performance of a contract. In the law of mortgage the deposit of title-deeds is usual as a security for the repayment of money advanced. Such a deposit operates as an equitable mortgage. In the law of contract, deposit or simple bailment is delivery or bailment of goods in trust to be kept without recompense, and redelivered on demand (see Bailment) . ”