There are several ways by which the operations of the subjective mind can be brought above the threshold of consciousness. When this is done by any one of the various methods, a phenomenon is produced. Each of these phenomena has been, at some time in the history of mankind, attributed to the agency of disembodied spirits. The leading phenomena above alluded to are clairvoyance, clairaudience, telepathy, mesmerism, or hypnotism, automatic writing, percussive sounds (spirit-rapping), movement of ponderable bodies (table-tipping), and phantasmic appearances. Of these, clairvoyance, telepathy, and hypnotism have generally ceased to be regarded as proceeding from supernatural agencies. They are now recognized as powers inherent in mankind, and, as will be seen, are largely employed to explain other phenomena. Of clairvoyance little will be said, for the reason that it is still an open question among scientists who have been, and are still, investigating the subject, whether independent clairvoyance exists as a power of the human mind. Sufficient evidence has not been brought to my attention to demonstrate its existence. Certainly the great bulk of phenomena which are popularly regarded as evincing clairvoyant power must now be referred to telepathy. It must be said, however, that many phenomena have been produced which cannot at present be accounted for on any other hypothesis than that of independent clairvoyance. Yet it is not impossible that, when the laws of telepathy are better understood, all so-called clairvoyant phenomena may be referred to that agency. For the purposes of our argument, however, it is not specially important that the distinction should be clearly drawn between the two, inasmuch as telepathy, which is an undoubted power of the subjective mind, sufficiently explains all the so-called spiritistic phenomena involving the perception by the medium of facts not within his own experience or his previous knowledge. I will therefore first treat of those phenomena the mysteries of which are directly and primarily referable to telepathy.