"The horizon of matter, which has been thought to rest over attenuated hydrogen, may extend to infinite reaches beyond, including stuffs or substances which have never been revealed to the senses. Beings fashioned of this attenuated substance might walk by our side unseen, nor cast a shadow in the noon day sun. [see alphanon through Hydron in this Table of the Elements for elements that "rest over attenuated hydrogen"]
"This supposition of itself admits that hydrogen is a compound. If it were indivisible it would assimilate with the high luminous, from which all substances are formed or aggregated. If hydrogen were a simple it could not be confined. No molecular structure known to man can hold the interluminous, not even the low order of it that is chemically liberated. The word "attenuated" admits that hydrogen is a compound. I contend that hydrogen is composed of three elements, with a metallic base and comes under the order of the second atomic, both in vibration and sympathetic outreach.
"Hydrogen exists only where planetary conditions exist, there it is always present, but never in uninterfered space. There is much celestial material that has never been revealed to the senses. My researches lead me to think that hydrogen carries heat in a latent condition, but I do not believe it will ever be possible to originate a device that will vibrate hydrogen with a velocity to induce heat.
"The word imponderable as applied to a molecule is incorrect. All gases as well as atmospheric air are molecular in their structure. If atmospheric air is subdivided by atomic vibration, it merely dissociates the hydrogen from the oxygen neither of which, though disunited, passes from the intermolecular state, and not until hydrogen is sympathetically subdivided in its intermolecular structure by interatomic vibrations can it assimilate with the introductory etheric element. There is a wonderful variation of gravital sympathy between the gaseous elements of compounds, all of which comes under the head of molecular.
October 1, 1891, Keely writes: "I see no possibility of failure as I have demonstrated my theories are correct in every particular, as far as I have gone and if my depolarizer is perfect, I will be prepared to demonstrate the truth of disintegration, cerebral diagnosis, aerial suspension and dissociation, and to prove the celestial gravital link of sympathy as existing between the polar terrestrial and equation of mental disturbance of equilibrium."
Two years have passed since this was written, during which Keely has been engaged in perfecting his system for aerial navigation. One by one he has overcome all obstacles, gained control of the mysterious polar current, so that he has been able to exhibit on the thirds, or molecular graduation of the propeller of his air-ship, 120 revolutions in a minute, and on the sixths, or atomic graduation, 360 revolutions in a minute. He still has the etheric field to conquer.
In the spring of 1890 he succeeded in raising the metal weight by an unknown force. When he has gained as perfect control of it as we now have of steam, airships weighing thousands of tons can traverse the highways of the air.
The vibration known as heat ruptures the molecules of the nitre, sulphur and charcoal in [gun]powder, which explodes. Dynamite requires another order of vibration, concussion, to release the latent force held in the molecular embrace. The order of vibration used by Keely, which causes the rupture of the molecular and atomic capsules of the constituents of water, must remain, though in one point only, a secret with the discoverer, until he has completed his system for science, and some one patentable invention. He has proved to his own satisfaction the actual existence of atoms and their divisibility.
Elements are defined as simple substances out of which no other two or more essentially differing substances have been obtained. Compounds are bodies out of which two or more essentially differing substances have been obtained. A molecule is the smallest part of a compound or element that is capable of existence in a free state. Atoms are set down, by those who believe in the atomic theory, as the indivisible constituents of molecules. Thus, an element is a substance made up of atoms of the same kind, a compound is a substance made up of atoms of unlike kind.
Over seventy elements are now  known. Priestly claimed that all discoveries are made by chance.
The hypothesis that motion can only be effected mechanically, by pressure or traction or contact of some kind, is an utterly helpless one to explain even familiar movements gravitation, sympathetic association, etc.