Having seen that the first question of the sceptical critics is capable of being answered in the scientific spirit, and by ideas based upon scientific investigation, we now turn to the second question of the same critics, viz.: "Granted the existence of such vibratory energy, or thought-waves, how and by means of what channel does the second person receive these from the first person? How are they registered or recorded?" This same question is also implied in the concluding sentence of one of the scientists above quoted, viz.: "There is no good reason whatever for supposing that matter is incapable of such intermediate activity, or that such activity may not give rise to intermediate sensations, provided that there are organs for taking up and sensifying these movements." Let us see what science has to tell us regarding the provision of Nature for the reception and "sensing" of this class of vibratory energy. And the easiest way to ascertain the report of science regarding this important matter is to consider carefully what representative leading scientists have said concerning the same in their writings or public addresses. We call your attention to the following quotations from such sources. A Great Scientist's Theory. Let us begin with that great master of modern science, Sir William Crookes, the inventor of the celebrated "Crookes' Tubes," without which the discovery of the X-Ray and Radio-Activity would have been impossible. Several years ago, this eminent scientist, addressing the Royal Society, at Bristol, England,--a gathering made up of distinguished scientists from all over the world, most of the members being extremely sceptical concerning occult phenomena--said to the brilliant gathering: "Were I now introducing for the first time these inquiries in the world of science, I should choose a starting point different from that of old (where we formerly began). It would be well to begin with Telepathy; with that fundamental law, as I believe it to be, that thoughts and images may be transferred from one mind to another without the agency of the recognized organs of sense--that knowledge may enter the human mind without being communicated in any hitherto known or recognized ways. * * * If Telepathy takes place we have two physical facts, viz., (a) the physical change in the brain of A, the transmitter, and the analogous physical change in the brain of B, the recipient of the transmitted impression. Between these two physical events there must exist a train of physical causes. * * * It is unscientific to call in the aid of mysterious agencies, when with every fresh advance in knowledge it is shown that ether vibrations have powers and attributes abundantly able to meet any demand--even the transmission of thought.