His last engine was built to exhibit the practical nature of his discovery to capitalists, the managers of "The Keely Motor Company"--which company died a natural death years since--hoping thereby to raise the price of its stock, and in this way to furnish Mr. Keely with the funds that he needed. But the exhibition of this engine was premature and did not succeed. There will be no further need for such exhibitions in future, for it is, as it always has been, in the interest of stock-holders that the stock should not rise until the system is completed, when it will rise to remain raised. From this time the interests of stock-holders will not be sacrificed to the interest of stock-jobbers. The experiments conducted on Saturday last surpassed preceding ones in the purity of the demonstrations, the instruments being in better condition. In demonstrating what seems to be the overcoming of gravity for aerial navigation, Mr. Keely used a model of an air-ship, weighing about eight pounds, which, when the differentiated wire of silver and platinum was attached to it, communicating with the sympathetic transmitter, rose, descended, or remained stationary midway, the motion as gentle as that of thistledown floating in the air. The experiment illustrating "chord of mass" sympathy was repeated, using a glass chamber, forty inches in height, filled with water, standing on a slab of glass. Three metal spheres, weighing about six ounces each, rested on the glass floor of the chamber. The chord of mass of these spheres was B flat first octave, E flat second octave, and B flat third octave. Upon sounding the note B flat on the sympathetic transmitter, the sphere having that chord of mass rose slowly to the top of the chamber; the positive end of the wire having been attached, which connected the covered jar with the transmitter. The same result followed the sound of the note in sympathy with the chord of mass of the other spheres, all of which descended as gently as they rose, upon changing the positive to the negative. J. M. Willcox, Ph.D., who was present, remarked,--"This experiment proves the truth of a fundamental law in scholastic philosophy, viz., that when one body attracts or seeks another body, it is not that the effect is the sum of effects produced by parts of one body upon parts of another, one aggregate of effects, but the result of the operation of one whole upon another whole."