" Accord and satisfaction is the purchase of a ,release from an obligation whether arising under contract or tort by means of any valuable consideration, not being the actual performance of the obligation itself. The accord is the agreement by which the obligation is discharged. The satisfaction is the consideration which makes the agreement operative. Formerly it was necessary that the consideration should be executed Later it was conceded that the consideration might be executory The consideration on each side might be an executory promise, the two mutual promise making an agreement enforceable in law, a contract I An accord, with mutual promises to perform, is good, though 'the thing be not performed at the time of action; for the party has a remedy to compel the performance', that is to say, a cross action on the contract of accord if, however, it can be shown that what a creditor accepts in satisfaction is merely his debtor's promise and not the performance of that promise, the original cause of action is discharged from the date when the promise is made. "