My friend and publisher Charles Boni thinks that I should write this book without protestations; taking a dignified position, sure that my readers will trust me. But as it happens, I have read, not merely the literature of psychic research, but also the literature in opposition to it, and I know the arguments advanced by persons who are unwilling to change their “fundamental notions.” It seems common sense to answer here the objections which are certain to be made. I submitted this manuscript to the two leading psychologists of America, Morton Prince and William McDougall. Dr. Prince was taken by death before he found time to read it, but Professor McDougall read it, and has stated his reactions in the preface. In writing to me, he expressed the hope that my wife would be able to make some of these telepathy tests under the observation of well-known scientists. In replying, I assured him that my wife and I shared this hope; but whether it can ever be realized is a problem for the future. All Craig’s work so far has depended upon a state of complete peace and relaxation. As she has pointed out, it is a matter of “undivided concentration,” and even such disturbing things as light and noise are an interference. One friend who has tried to experiment lately at our instigation gave it up because of automobile horns in the street outside. She declared that these had never disturbed her before, but that the effort not to hear them when concentrating only caused her to concentrate on the horns, and so threatened to give her a case of “nerves.” Whether Craig would be able to get the necessary state of mind in the presence of strangers, skeptical or possibly hostile, is a problem yet to be solved. Unless we are going to beg the question, we have to assume that telepathy may be a reality; and if it be a reality, then certainly what is in the other person’s mind makes a difference, and certainly it is a serious matter to ask a woman in delicate health to open her mind to the moods of strangers. Some day in the future Craig is going to make the test, but whether it succeeds or fails will not alter, so far as I am concerned, what has already happened in my presence.