It i~ expected we shall sail to-morrow morning for Boston, under the command of Commodore William Hotham, who is to hoist his broad pennant on board the Preston, a 50 gunship. The ships which go under his command, are, the Jersey hospital ship, the Emerald of 32 guns, the Brune, of 32 guns, the Strombolo fire ship, the Carcass bomb, and all the transports which are ready. There are upwards of 100 sail of transports now here, all of which have foreign troops on board. We have on board five small casks and thirty small chests of Spanish dollars, amounting to 35,000 l for paying the marine troops at Boston.