1. An examination of the nature and extent of any influence which may be exerted by one mind upon another, otherwise than through the recognized sensory channels. 2. The study of hypnotism and mesmerism, and an inquiry into the alleged phenomena of clairvoyance. 3. A careful investigation of any reports, resting on testimony sufficiently strong and not too remote, of apparitions coinciding with some external event (as for instance a death) or giving information previously unknown to the percipient, or being seen by two or more persons independently of each other. 4. An inquiry into various alleged phenomena apparently inexplicable by known laws of nature, and commonly referred by Spiritualists to the agency of extra-human intelligences. 5. The collection and collation of existing materials bearing on the history of these subjects.[72] [Footnote 72: "Spiritualism," Hill, p. 100.] They sought also "to approach these various problems without prejudice or prepossession of any kind and in the same spirit of exact and unimpassioned inquiry which has enabled science to solve so many problems, once not less obscure nor less hotly debated." As a matter of fact the region is the most obscure which inquiry has ever been called to enter. A noble rationality pervades the whole normal material order, causes can be controlled, effects anticipated, laws formulated and above all, the hypotheses of science are, if true, always capable of a luminous and splendid verification. The disciplined intellect moves through it all with a sense of "at-homeness" which is itself a testimony to profound correspondences between the human mind and the order with which, during its long, long unfolding, it has been associated in intimacies of action and reaction too close to be adequately set forth in words. But the mind does not rest easily in the region which Spiritism claims for its own. _The Difficulties It Confronts_