"MORSE'S ELECTRO-MAGNETIC TELEGRAPH. "This important invention is to be exhibited in operation at Castle Garden between the hours of twelve and one o'clock to-day. One telegraph will be erected on Governor's Island and one at the Castle, and messages will be interchanged and orders transmitted during the day. Many have been incredulous as to the powers of this wonderful triumph of science and art. All such may now have an opportunity of fairly testing it. It is destined to work a complete revolution in the mode of transmitting intelligence throughout the civilized world." At daybreak the professor was on the Battery, and had just demonstrated his success by the transmission of three or four characters between the termini of the line, when the communication was suddenly interrupted, and it was found impossible to send any messages through the conductor. The cause of this was evident when he observed no less than seven vessels lying along the line of the submerged cable, one of which, in getting under way, had raised it on her anchor. The sailors, unable to divine its meaning, hauled in about two hundred feet of it on deck, and finding no end, cut off that portion and carried it away with them. Thus ended the first attempt at submarine telegraphing. The crowd that had assembled on the Battery dispersed with jeers, most of them believing they had been made the victims of a hoax. In a letter to John C. Spencer, then Secretary of the Treasury, in August, 1843, concerning electro-magnetism and its powers, he wrote: "The practical inference from this law is that a telegraphic communication on the electro-magnetic plan may with certainty be established across the Atlantic Ocean. Startling as this may now seem, I am confident the time will come when this project will be realized."