Telepathy, from the two Greek words, _tele_, at a distance, and _pathos_, feeling, has been much discussed in recent years. Many people who use the word glibly are inclined to think they know much about it. A long word, however, is not an explanation, and, just here, George Eliot's expression "we map out our ignorance in long Greek names" is worth recalling. There are a number of phenomena that seem to require some such theory as that of telepathy, but the phenomena are still under discussion and their significance is by no means clear. As we understand it, telepathy may mean either thought transference or mind reading, that is, either the active process by which we communicate our thought to someone at a distance, or the passive process by which we receive communications from others. These thoughts include the idea of mental influence at a distance; that is, we can by willing influence the wills, or at least the motives to action, of people at a distance and they may, in turn, influence ours. The further thought has come, that since the mind largely influences the body in matters of health, so mental influence from a distance by affecting mind, may either improve or injure health. Some sensitive people are disturbed by the thought that they may be influenced from a distance by others, or at least that suggestions that come to them, may be due to telepathic influence. Investigation would probably show that there are at least as many persons disturbed by real or supposed telepathic influences as there are of those who have hallucinations. Sometimes it is said that such persons are not quite sane, but the more experience a physician has with them, the more he dismisses the thought of insanity and proceeds to use contrary suggestion and frank discussion, in order to counteract the mental influences. Insane persons think they are being influenced from a distance just as they hear voices and see visions, but such hallucinations may occur to the sane, as apparent telepathic experiences may also.