Time only can decide whether Keely's hypotheses and theories will outlive these tests. If not, his system must be overthrown, as past systems have been, to make room for a better one. All that I ask is that he may have the opportunity to develop it under your encouragement. There are scientists in Europe ready to assist him with pecuniary assistance. They know enough--those who are interested in his discoveries--to know that they can help him in no other way. Professor Hertz of Bonn, said to me: "Keely must work out his system himself to that point where he can instruct physicists to repeat his experiments." Picking up a photograph of Keely's instruments of research, grouped together, he added: "No man is likely to be a fraud who is working on these lines." Science is alert, on tiptoe as it were, waiting for the one mighty explanation of the force, "behind the framework of nature," which has hitherto "eluded its skill;" and which the system of Keely makes clear to the understanding, demonstrating that one power, one law, reigns throughout creation; the immaterial controlling the material, after the divine order and law of creation that the immaterial should govern the material--that the whole realm of matter is under the dominion of the immaterial. But "the known always excludes the unknown" when in opposition to it. As in past generations, so now in ours, physicists have said: "We will not waste our time in looking at facts and phenomena which cannot be accepted in opposition to established principles of science and to known laws of nature; and which, even if we beheld we should not believe." The recognition and practical application of new truths are, as has been said, notoriously slow processes. Harvey's beneficent discovery excited vehement opposition from his contemporaries. Professor Riolan combated this discovery with as much obstinacy as violence; even denying the existence and the functions of lymphatic vessels. Harvey himself united with Riolan in opposing the discoveries of Aselli and Pacquet respecting the lymphatic system. Jenner's discovery met with the same opposition, and more than forty years elapsed before the suggestion of Sir Humphrey Davy became of practical use. Mr. Wills was so affected by the ridicule which he encountered in his experiments with nitrous oxide in destroying physical pain, that he abandoned them. Nearly half a century later Dr. Morton was assailed by several of our journals in America for the use of ether in producing anæsthesia; as also was Sir James Simpson for his use of ether and chloroform.