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A curious consequence was pointed out by Maxwell as a result of his theory; namely, that a necessary relation exists between opacity and conductivity, since, as he showed, electro-magnetic disturbances could not be propagated in substances which are conductors of electricity.
The key-note was struck, and before his ship reached New York the invention of the telegraph was virtually made, and even the essential features of the electro-magnetic transmitting and recording apparatus were sketched on paper. Of necessity, in reaching this result, Morse made use of the ideas and discoveries of many other minds.
There is another searching for that new motive power which shall keep pace with the telegraph, and hurl the bodies of men through space as fast as their thoughts are hurled; there is another seeking that electro-magnetic battery which shall speak instantly and distinctly to the ends of the earth.
If we analyse our sense of sight, we find that the only impression made on our bodies by external objects is the image formed upon the retina; we have no cognisance of the separate electro-magnetic rills forming that image, which, reflected from all parts of an object, fall upon the eye at different angles, constituting form, and with different frequencies giving colour to that image; that image is only formed when we turn our eyes in the right direction to allow those rills to enter; and, whereas those rills are incessantly beating on the outside of our sense organ when the eyelid is closed, they can make no impression unless we allow them to enter by raising that shutter.
Perhaps the most conclusive evidence that Vail did not invent this alphabet is contained in his own book on the "American Electro-Magnetic Telegraph," published in 1845, in which he lays claim to certain improvements. After describing the dot-and-dash alphabet, he says:
The Electro-Magnetic Restorer I offered you would be a great boon to your race, and could not possibly do harm. And, besides this, I have brought you what I call the Illimitable Communicator. It is a simple electric device which will enable you, wherever you may be, to converse with people in any part of the world, without the use of such crude connections as wires. In fact, you may "
"Yes," he cried, now for the first time excited. "Don't you begin to see the scheme? I'll wager that Baron Kreiger has been lured to New York to purchase the electro-magnetic gun which they have stolen from Fortescue and the British. That is the bait that is held out to him by the woman. Call up Miss Lowe at the laboratory and see if she knows the place."
Cornelius Dumany, Esquire." The contents of the letter were as follows: "DEAR FRIEND, Aunt Diodora has her nervous attack, and is dangerously ill. Pray make haste! Periculum, in mora. Bring your electro-magnetic apparatus with you, and come at once. The gamekeeper had brought the letter, and said that he had strict orders to wait for me, if it was until midnight.
Another closure develops the field again, which, like the other, travels outwards; and so there may be formed a series of waves in the ether, each 186,000 miles long, with an electro-magnetic antecedent. If the circuit were closed ten times a second, the waves would be 18,600 miles long; if 186,000 times a second, they would be but one mile long.
The vital truth of immortality is to be immortal now, to-day; to be spiritually alive, spiritually conscious, and with this achieved, whether in or out of the body is immaterial. That becomes a mere detail of no special significance. Given the condition of spiritual vitality, and the electro-magnetic call would receive its reply from the friend who had "shed" his body.
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