Robbebt at the Exoha.vue Hotel.—Mr. Weith's room, at the Exchange, was entered through the window on Monday night last and robbed of about eleven hundred and seventy nine dollars in money. Being mostly notes on Southern banks, they were easily identified, and yesterday a man named William Preston Knuckles was nrrested while engaged in trying to exchange them at a broker's office. The thief, in leaving the room, passed out ns he