It is not to be wondered at that the magical nature of his demonstrations, more inexplicable than any feats of legerdemain, should have brought upon him the suspicion of fraudulent representation, concerning the production of the force and its manipulation; but his persistency alone in seeking to unravel the mysteries of nature, ought to have brought around him sooner men who, like the revered and great Leidy, were able to appreciate his researches in sympathetic vibration, the laws of which govern everything in creation, from the movements of the planets, down to the movements of atoms. From the time in which it was made known to Keely that the same principle underlies harmonies and the motion of heavenly bodies, as announced by Pythagoras, his grasping intellect conceived the idea that planetary bodies have a nerve-system, subject to conditions which govern it and keep it under control, just as our human mechanism is controlled by the law which governs its operation. In Keely's theories all is mechanical in nature. A molecule of steel, a molecule of gas, a molecule of brain matter are all of the one primeval substance--the Ether. AERIAL NAVIGATION. The instrument devised by Mr. Keely for bringing the air-ship under control in its ascent and descent, consists of a row of bars, like the keys of a piano, representing the enharmonic and the diatonic conditions. These bars range from 0 to 100. At 50 Mr. Keely thinks the progress of the vessel ought to be about 500 miles an hour. At 100 gravity resumes its control. If pushed to that speed it would descend like a rifle-ball to the earth. There is no force known so safe to use as the polar flow if, as Mr. Keely thinks, that, when the conditions are once set up, they remain for ever, with perpetual molecular action as the result, until the machinery wears out. In the event of meeting a cyclone, the course of the vessel, he teaches, can be guided so as to ascend above the cyclone by simply dampening a certain proportion of these vibratory bars. The instrument for guiding the ship has nothing to do with the propelling of it, which is a distinct feature of itself, acting by molecular bombardment; moving the molecules in the same order as in the suspension process, but transversely. After the molecular mass of the vessel is sensitized, or made concordant with the celestial and terrestrial streams, the control of it in all particulars is easy and simple. In ascending the positive force is used, or the celestial, as Keely has named it, and in descending the negative or terrestrial. Passing through a cyclone the air-ship would not be affected by it. The breaking up of cyclones will open a field for future research, if any way can be discovered for obtaining the chord of mass of the cyclone. To differentiate the chord of its thirds would destroy it; but to those who know nothing of the underlying principle, on which Keely has based his system, all such assertions are the merest "rubbish."