Only the theory of chance coincidence can be applied as a single explanation of the experiments of all three classes. Let this be done and there is simply massed a greater amount of material for the demolition of the chance coincidence theory by anyone who will undertake a large series of precisely parallel experiments in Guessing. For myself, I am willing to say, perhaps for the fourth time, that I am willing to rest the whole case on those experiments to which no one, presumably, will have the hardihood to apply either the theory of “involuntary whispering” or that of “peeking,” that is to say, those experiments in which agent and percipient were either in separate rooms or many miles apart. An Interpretation of Mrs. Sinclair’s Directions Mrs. Sinclair, on pages 116–128 of _Mental Radio_, outlines on the basis of her own experience the method which she thinks best calculated to develop an ability to attain at will a mental state which will enable some of her readers to receive and record telepathic impressions to an evidential degree. I propose, at the same time recommending that prospective experimenters shall obtain the book and read the full directions, to attempt a condensation of them. To some extent I shall interpret them; that is, state them in other terms, which it is hoped will not be the less lucid. As a matter of psychological fact, you cannot “make your mind a blank,” though you can more or less acquire the art of doing at will what you sometimes involuntarily do—you can practice narrowing the field of consciousness, so that instead of being aware of many things external and of various bodily sensations, your attention is fixed almost exclusively for a time on one mental object. Some persons at times become so absorbed in a train of thought that with eyes open and with conversation around them they are hardly conscious of anything seen or heard. But it is best to assist the attainment of such a state as Mrs. Sinclair does, by closing the eyes, and it is best that silence should prevail. When one remembers how in revery he has become oblivious to all around him, or how when witnessing an entrancing passage in a play everything in the theatre except the actors and their immediate environment has faded out of consciousness, he will have no difficulty in understanding what Mrs. Sinclair really means by saying that “it is possible to be unconscious and conscious at the same time,” although taken literally that is not a correct statement.