Another instance of interruption was occasioned by the falling of a tree, which accidently fell across the wires, and at the same time across the rail road track, stopping the cars for a short time, and the telegraphic communication for two hours. Excepting the time excluded by these, and two or three other similar accidental interruptions, and which, during seven months of its effective existence between the two cities, does not altogether amount to more than 24 hours, the telegraph has been either in operation, or prepared for operation, at any hour of the day or night, irrespective of the state of the weather. It has transmitted intelligence of great importance. During the troubles in Philadelphia the last summer, sealed despatches were sent by express from the Mayor of Philadelphia to the President of the United States. On the arrival of the express at Baltimore, the purport of the despatches transpired; and while the express train was in preparation for Washington, the intelligence was sent to Washington by telegraph, accompanied by an order from the president of the rail road company to prevent the Washington burden train from leaving until the express should arrive. The order was given and complied with. The express had a clear track, and the President and the Cabinet (being in council) had notice both of the fact that an express was on its way with important despatches to them, and also of the nature of those despatches, so that, when the express arrived, the answer was in readiness for the messenger. In October, a deserter from the U.S. ship Pennsylvania, lying at Norfolk, who had defrauded also the purser of the ship of some $600 or $700, was supposed to have gone to Baltimore. The purser called at the telegraph office in Washington, stated his case, and wished to give notice in Baltimore, at the same time offering a reward for the apprehension of the culprit. The name and description of the offender’s person, with the offer of the reward, were sent to Baltimore, and in ten minutes the warrant was in the hands of the officers of justice for his arrest; and in half an hour from the time that the purser profferred his request at Washington, it was announced from Baltimore by the telegraph, “The deserter is arrested; he is in jail; what shall be done with him?”