But to return to the question asked in the Home Journal. "Can this subtle force reasonably be expected to be caged and fettered by mere earthly instruments? "This is the answer, as given by Keely himself: "You ask my opinion regarding my ultimate success in the practical use of etheric force. My faith is unbounded by doubts. The successful result is as positive as the revolutions of our globe, and comes under the great law which governs all nature's highest and grandest and most sensitive operations." Since Keely wrote the above lines he has had time to get discouraged, if he could know discouragement; but he has conquered too many of the stupendous problems, which barricaded his way in the past, not to feel equally sanguine now of eventual success in his last problem, viz. the attaining of continuity of action, which at the present time seems all but within his grasp. Some of his views may prove of interest at a time when his achievements are beginning to be a little better understood. Gravity he defines as transmittive inter-etheric force under immense etheric vibration. He continues:--The action of the mind itself is a vibratory etheric evolution, controlling the physical, its negative power being depreciatory in its effects, and its positive influence elevating. The idea of getting a power as tenuous as this under such control as to make it useful in mechanics is scouted by all physicists. And no wonder that it is so. But when the character of the velocity of etheric force, even in a molecule, is understood, the mind that comprehends it must succumb to its philosophy. To move suddenly a square inch of air, at the velocity of this vibratory circuit, on full line of graduation, and at a vibration only of 2,750,000 per second, would require a force at least of twenty-five times that of gunpowder. Taking the expansive force of gunpowder at 21,000 lbs. per square inch, it would be 525,000 lbs. per square inch. This is incomprehensible. The explosion of nitroglycerine, which has two and a half times less vibrations per second, when placed on the surface of a solid rock, will tear up the rock before disturbing the equilibrium of the air above it. The disturbance takes place after the explosion. To induce an action on a weight of only twenty grains, the weight of a small bird-shot, with a range of motion of but one inch, giving it an action of one million per second, would require the actual force of two and a half tons per second; or, in other words, ten-horse power per minute. Etheric vibration would move tons at the same velocity when submitted to the vibratory circuit. Thus, the finer the substance the greater the power and the velocity under such vibration.