As early as 1861 Moses G. Farmer introduced a successful method of signaling which afterward was employed by the officers of the United States Coast Survey on Lake Superior. This system was by means of mirrors which were able to reflect the sunlight between stations ninety miles apart. This method is called the heliographic system. The French have used it among the islands of the Indian Ocean where the stations are on mountain peaks sometimes 135 miles apart. Even this long-range signaling has been surpassed by our own Signal Corps, which has succeeded in sending messages by our method from Mount Uncompahgre in Colorado to Mount Ellen in Utah, a distance of 183 miles. During the siege of Paris, messages by the use of the calcium light, concentrated and directed by lenses, were sent from one point to another. A very unique form of signaling was employed by New York State at the opening of the Erie Canal, in 1825. The cannon, which had been captured by Commodore Perry at the time of his famous victory on Lake Erie, were placed at intervals along the line of the canal. When the first canal boat started from Buffalo, the first cannon was fired. When the sound was heard at the second cannon, that was discharged; and so on, the entire length of the canal. Two hours after the start at Buffalo the news had reached New York. All these various methods of communication at long range have proved more or less objectionable and unsatisfactory. It was natural, therefore, that as soon as it was known that electricity could be conducted by wires from one place to another, experiments should be begun in the hope of finding some possible means of conveying intelligence by it. Perhaps the earliest suggestion was in a letter published in _The Scots Magazine_, of February, 1753. The letter was signed "C. M.", which probably meant Charles Morrison, a young Scotch surgeon. He proposed to use as many insulated conductors as there were letters in the alphabet. Each wire was to represent one letter only, and the message would be sent by charging the several wires in succession so that the operator in receiving it would be obliged to notice the order of movement among the wires. From that simple beginning inventors proceeded to suggest first one thing and then another, but they found so many difficulties that it seemed impossible to overcome them all. CHAPTER V. THE TELEGRAPH. [Illustration: ELECTRIC WIRES.]