It would take me too far, and the facts are too doubtful, to investigate the large class of cases included under the terms thought-reading, telepathy, psychism, and spiritualism. It may suffice to say that there is a good deal of evidence for the reality of very curious phenomena, but none of any real weight for their being caused by any spiritualistic or supernatural agency. They all seem to resolve themselves into the assertion that under special conditions the perceptions of one brain can be reproduced in another otherwise than by the ordinary medium of the senses, and that in such conditions a special sort of cataleptic energy or psychic force may be developed. The amount of negative evidence is of course enormous, for it is certain that in millions upon millions of cases thought cannot be read, things are not seen beyond the range of vision, and coincidences do not occur between deaths and dreams or visions. Neither can tables be turned, nor heavy bodies lifted, without some known form of energy and a fulcrum at which to apply it. This borderland of knowledge is, therefore, best left to time, which is the best test of truth. That which is real will survive, and be gradually brought within the domain of science and made to fit in with other facts and laws of nature. That which is unreal will pass away, as ghosts and goblins have done, and be forgotten as the fickle fashion changes of superstitious fancy. In the meantime we shall do better to confine ourselves to ascertained facts and normal conditions. It is pretty certain that although the brain greatly preponderates as an organ of mind in man and the higher animals, the grey tissue in the spinal marrow and nervous ganglia exercises a limited amount of the same functions proportionate to its smaller quantity. The reflex or automatic actions, such as breathing, are carried on without reference to the brain, and the messages are received and transmitted through the local offices without going to the head office. This is the case with many complicated motions which originated in the brain, but have become habitual and automatic, as in walking, where thought and conscious effort only intervene when something unusual occurs which requires a reference to the head office; and in the still more complex case of the piano-player, who fingers difficult passages correctly while thinking of something else or even talking to a bystander.