“ It is an undeniable principle of the law of contracts, that an offer of a bargain by one person to another, imposes no obligation upon the former, until it is accepted by the latter, according to the terms in which the offer was made. ”

“ A letter from the plaintiffs to the defendant, dated the 10th of February 1813, in which they say: 'Capt. Conn informs us, that you have a quantity of flour to dispose of. We are in the practice of purchasing flour at all times, in Georgetown, and will be glad to serve you, either in receiving your flour in store, when the markets are dull, and disposing of it, when the markets will answer to advantage, or we will purchase at market price, when delivered ”