A correspondent in Invention, London, writes December 12, 1891: We have at various times in these columns alluded to the investigations of the Philadelphia scientist, J. W. Keely, and this researcher--who is now stated to be engaged in finding a method whereby the power [18] which he professes to have discovered can be employed as a motor in the place of steam--is just now the object of considerable attention in the press of the United States. To summarize the present state of the criticism to which this man is subjected, we may mention that for some time past The New York Herald, among other papers, has been printing a series of articles that have been recently prepared by an American inventor named Browne, professing to show how Keely has, for nearly twenty years, been deceiving expert engineers, shrewd men of the world, some few university professors and others, by the use of compressed air, obtaining testimonials of his discovery of an unknown force in nature. In reading his articles any one who has seen the photographs--as the writer has done--of the researching instruments discarded by Keely, in past years, and those that he is now employing in their place, cannot fail to detect the misstatements and misrepresentations made. Mr. Browne (?) even overrides the testimony of the late Professor Leidy, Dr. Willcox, Dr. Koenig, Dr. Brinton--the Baltimore physicist--Dr. Tuttle, and the engineers Linville and Le Van, all of whom have tested the force used by Keely, and admitted that no electricity, no magnetism, no compressed air is used. Without endorsing in the slightest anything that Keely has discovered, or claims to have discovered, we think that, with the English love of fair play, both sides should always fairly be heard before either is condemned, and as Mr. Keely has consented to instruct a well-known English physicist in his method of producing the force handled, there is every chance of the truth being known, and the correct state of the matter divulged to the scientific world at large, when, mayhap, this rival inventor may have to retract his assertions or stand a suit for libel. We do not say it will be so--we only assert it may be. Professor Brinton, who has made a study of Keely's methods, writes this month to a friend in London:--"The exposé of Keely's alleged methods continues each week. Some of the proposed explanations are plausible, others are plainly absurd. They only serve to attract renewed attention to Keely. I have written to the editor to ask him to arrange a meeting for me with the writer, but I have not yet been able to discover the Mr. Browne, [19] of Brooklyn, who is the supposititious author."