The physicist tells you that "you cannot make something out of nothing;" that "in the economy of nature profit and loss must balance;" that "no matter what the nature of the force may be, its production must necessarily be accompanied by a corresponding expenditure of force in some form or other," etc., etc. But, in the prodigality of nature, this energy flows, without measure and without price, from the great storehouse of the Infinite Will. From the sympathetic portion of the etheric field, all visible aggregations of matter emanate, and on the same order that molecular masses of all living organisms are vitalized by the sympathetic flow from the brain. "Our most learned men," said Buckle, "know not what magnetism is, nor electricity, nor gravity, nor cohesion, nor force." Keely shows us, by mechanical means, what magnetism is. By neutralizing or overcoming gravity, he proves to us that he understands its nature; electricity he declares to be a certain form of atomic vibration; and, in the disintegration of quartz, he demonstrates that cohesive force, like gravity, is an ever-existing force, holding together all molecular masses by the infinite velocity of its vibrations; which, were these vibrations to cease for one instant, would fall apart, molecules and atoms, and return to the ether in which they originated. KEELY'S CONTRIBUTIONS TO SCIENCE. [9] An infinitely subtle substance, out of which all other substances are constituted, in varying forms, passes back again into simplicity. The same principle underlies the harmonies of music and the motion of heavenly bodies.--Pythagoras. One of the most arduous problems is that of energies acting at distances. Are they real? Of all those that appear incontrollable, one only remains, gravitation. Will it escape us also? The laws of its action incline us to think so. The nature of electricity is another problem which recalls us to the condition of electric and magnetic forces through space. Behind this question arises the most important problem of all, that of the nature and properties of the substance which fills space,--the ether,--its structure, its motion, its limits, if it possesses any. We find this subject of research, day by day, predominating over all others. It seems as though a knowledge of ether should not only reveal to us the nature of that imponderable substance, but will unveil to us the essence of matter itself and of its inherent properties, weight and inertia. Soon the question set by modern physics will be, "Are not all things due to conditions of ether?" That is the ultimate end of our science; these are the most exalted summits to which we can hope to attain. Shall we ever reach them? Will it be soon? We cannot answer.--Prof. Henri Hertz, in La Revue Scientifique, October 26, 1888.