As this book is going to the printer, my attention is called to the fact that Dr. Carl Bruck of Berlin has published a book entitled “Experimentelle Telepathie,” in which he reports a series of tests closely resembling those here described. The main difference is that he used hypnotized subjects, four different young men, as the recipients of his telepathic messages. He made drawings at home, and locked them in a large portfolio, which he placed in an adjoining room from the subject, two or three yards distant through a wall. He himself sat in front of the hypnotized subject, and concentrated upon “sending” one of the drawings. Under these conditions, in a total of 111 experiments, one-third were successful. The Berlin correspondent of the “Scientific American” reported these tests in the issue of May, 1924, where those interested may read the details, and inspect twelve of the drawings. The tests were conducted in the presence of various physicians and scientists; and I am interested in a recent comment on the matter by a German physician living in Mexico City: “Bruck’s work has gone almost wholly unnoticed.” I say to scientific men, that such work deserves to be noticed. There is new knowledge here, close to the threshold, waiting for us; and we should not let ourselves be repelled by the seeming triviality of the phenomena, for it is well known that some of the greatest discoveries have come from the following up of just such trivial clews. What did Benjamin Franklin have to go on when he brought the lightning down from the clouds on the string of a kite? Just a few hints, picked up in the course of the previous hundred years; a few traces of electricity noted by accident. The fact that you got a spark if you stroked a cat’s fur; the fact that you got the same kind of a spark by rubbing amber, and a bigger one by storing the energy in a glass jar lined with tinfoil—that was all men had as promise of the miracles of our time, dynamos and superpower, telegraph and telephone, x-ray surgery, radio, wireless, television, and new miracles just outside our door. If now it be a fact that there is a reality behind the notions of telepathy and clairvoyance, to which so many investigators are bearing testimony all over the world, who can set limits to what it may mean to the future? What new powers of the human mind, what ability to explore the past and future, the farthest deeps of space, and those deeps of our own minds, no less vast and marvelous? To set limits to such possibilities is not to be scientific, it is merely to be foolish. The true scientist sets no limits to human powers, he merely asks that we verify our facts. This my wife and I have tried to do, and I think that, so far as concerns telepathy at least, we can claim success. We present here a mass of real evidence, and we shall not be troubled by any amount of ridicule from the ignorant. I tell you—and because it is so important, I put it in capital letters: TELEPATHY HAPPENS!