The advisability of sending out regular statements of account to purchasers under contracts must be left to the judgment of the vendor. The sending of such statements to those who are in arrears might in some cases tend to weaken the position of the vendor should he desire to cancel the contract. The best practice is to inform each purchaser that he may have a complete statement of his account whenever he asks for it, and to make a memorandum on his ledger account each time such a statement is rendered.