“This was an action of debt, commenced in the Circuit Court for the district of Georgia, by the District Attorney of the United States for that district, against the defendants, on a bond executed by them, in June 1820, to the Post Master General of the United States, the condition of which, after reciting that Eleazer Early (one of the co-obligors and defendants in the suit) is the Post Master at Savannah, provides that if he shall perform the duties of his office, ‘and shall pay moneys that shall come to his hands for the postages of whatever is by law chargeable with postage, to the Post