"In studies such as these we are passing from the investigation of the properties of ordinary matter to those of the ether, which may perhaps be the material of which matter is composed. We may some day be able to control and use it, as we now control and use steam." For nearly fifteen years, Keely constructed engines of various models, with this end in view, before he discovered that it is impossible to use the ether in any other way than as a medium for the energy that he is now experimenting with; and which he defines, in its present operation, as a condition of sympathetic vibration associated with the polar stream positively and negatively. Should Keely succeed in controlling and directing this subtle energy, we shall then be able to "hook our machinery on to the machinery of nature." A writer in the Nineteenth Century says,--"Whether the molecules or particles of what we know as matter are independent matter, or whether they are ether-whirlpools; we know that they keep up an incessant hammering one on another, and thus on everything in space. Professor Crookes has shown that the forces contained in this bombardment are immensely greater than any forces we have yet handled.... It has also been found that the vibrations keep time in some unknown way with the vibrations of solid matter." Thus it is seen that Keely is not the only man of science who is trying to effect a passage over the untrodden wild lying between acoustics and music: "that Siberian bog where whole armies of scientific musicians and musical men of science have sunk, without filling it up." Helmholtz, it is said, has, by a series of daring strides, made a passage for himself; while Keely stands alone in seeking to build a solid causeway; over which all the nations of the earth may pass in safety, to the "new order of things," that lies in this "land of promise." CHAPTER XIV. VIBRATORY PHYSICS.--THE CONNECTING LINK BETWEEN MIND AND MATTER. The elements of Nature are made of the will of God.--Hermes Trismegistus. Newton and Faraday have indicated how force instead of leaping over nothing, acting at a distance, is transmitted consecutively through the ethereal substance. We must become as little children, not presuming to think of causes efficient, or causes final; for these are things we cannot grasp; but reverently and patiently waiting until, like a revelation, the hidden link between the familiar and the unfamiliar flashes into our mind, and thus an additional step is gained in the endless series of successive generalizations.--The Rev. H. W. Watson, F.R.S., President of the Birmingham Philosophical Society. All truth comes by inspiration.--Scripture. There is but one Deity, the Supreme Spirit: he is of the same nature as the soul of man.-- Vedic Theology.