Molecular vibration is Keely's legitimate field of research. In this field his discovery was made, many years since; but it is only now, within this year, that he has reached any approach to a solution of the stupendous problems which have arisen barring and baffling all progress, at times, towards the complete subjugation and control of the force that he had discovered. Again and again has he invited the attention of scientists to his discovery, from the commencement of his researches; but the few scientists who condescended to accept his invitations were so ignorant of the mysteries which they sought to investigate--of 'the alphabet and rudiments' of etheric physics--that they found it easier to accuse him of jugglery and of fraud than to account for the phenomena that they witnessed. They addressed their report to a public even more ignorant than themselves, if such a thing could be possible, with the result of preventing other scientists, who would have better understood the experiments, from examining into Keely's claims, as the discoverer of an unknown force. A system of doctrine can be legitimately refuted only upon its own principles, viz., by disproving its facts, and invalidating the principles deduced from them. It is, then, the facts, and not the opinions of the ignorant or the prejudiced, which are of chief importance here, as in all other questions of moment. All those men who have witnessed the production of etheric force and its application experimentally, during the exhibitions given at various times, have, if capable of understanding such a marvellous discovery as Keely has made, agreed to a man in bearing testimony, at the time, that no known force could have produced such results under the same conditions. It is now three years since Keely invited certain English men of science (experimenting in the same field where his explorations commenced) to examine his Liberator; which was dismantled for the purpose, and all its parts assembled for examination before being put together for the production of etheric force, when these men refused to visit his workshop, and it has been said that a Professor of the University of Pennsylvania prevented the investigation by his assertion that compressed air is the force used by Keely with which to dupe his audiences. A schoolboy's knowledge of the change of temperature always accompanying the compression of air would prevent such an assertion from being made by anyone who had witnessed the operation of the Liberator in the production and storage of etheric force, during which there is not the slightest change of temperature. Had these English scientists, with their knowledge of acoustics, been present on the occasion referred to, no such groundless assertion would have possessed any influence with either; and the world of science would have sooner known and acknowledged the nature and the worth of this great discovery.