"Professor Barker, after due consideration, concluded not to accept the invitation, and declined it on October 11th, suggesting Professor Goodspeed, his associate in physics, as one who would probably be disposed to witness the series of experiments about to be given; showing the neutralizing or overcoming of gravity and the separation of metallic plates by vibration. After the date upon which these latter experiments were to have been made, and which I may mention, en passant, had been repeatedly made in the laboratory of Mr. Keely, this cablegram was sent from London to Philadelphia:-- 'Ask Dr. Leidy's permission to announce here his conviction that Keely has discovered a new force.'" The answer was returned as follows:-- "Having had the opportunity of seeing Mr. John Keely's experiments, it has appeared to me that he has command of some unknown force of most wonderful mechanical power. "Joseph Leidy." Invention, in commenting upon the communication, says: "We wish to make it quite clear that we do not identify ourselves with any of the opinions which are expressed in this communication. It is certainly desirable that the motor should be thoroughly tested, and particularly that all the secrecy, which has hitherto been practised in connection with it, should be abandoned. There can be no reason why this invention, if invention it be, should not be published to the world as long as it is fully protected by patents. We agree, however, so far, that Professor Barker's report, if his visit be paid, will be of considerable interest." These remarks of our English contemporary are based upon quite wrong premises. The motor cannot be tested nor patented until it is completed. Mr. Keely's work is one of experimental research. His machine for the production and liberation of the power is in daily operation. He has made many failures in constructing his commercial engine, but each failure has brought him nearer to perfection. When he has succeeded in building an engine in which he can regulate the speed, control reversions and govern its operations, as completely as the steam engine is now governed, then he will be ready to test its action publicly, take out patents for the same, and make known to the world the nature of his discovery. Up to the present time Mr. Keely's inventions have been principally devices, enabling him to experiment with the force which he has discovered and to obtain control over it. For years he was impeded by the frequency of the explosions which took place, breaking his ribs, paralyzing his left side for six weeks at one time, and frequently bursting iron tubes as if they were pipe stems.