She then told him, in answer to his questions, that the hemorrhage had set in about one o'clock, but had not been severe enough to alarm her until between three and four; and that it was not until nearly half-past four that she had decided to send for him. Nearly every instance of spontaneous clairvoyance that is sufficiently authenticated to compel credence, resembles these cases, and the similarity between them and cases of ordinary telepathic hallucination, as described in the chapter on telepathy, is too striking, it seems to me, to leave any doubt regarding their true nature. The only points of difference are that there is a greater amount of detail in clairvoyant visions, and that the percipient often experiences a sensation of being actually present at the scene beheld. But this latter fact is easily comprehensible when we remember that the same sensation of "otherplaceness" is often experienced in dreams that have no clairvoyant significance, and experienced with an equal feeling of reality, dissipated only when the dreamer awakes. As to the greater amount of detail, it is only necessary to assume that in clairvoyant cases the telepathic action is intensified by some favoring condition in the percipient's mind, just as some non-clairvoyant dreams are more detailed and vivid than others. Besides which, the telepathic basis of clairvoyance has been experimentally demonstrated. One of the investigators for the Society for Psychical Research, Mr. G. A. Smith, once hypnotized a lady and requested her to "look into" the business office of a friend of his and tell him what she saw there. Much to his surprise she immediately began to describe the office with great exactness, although he was positive she had never visited it. It then occurred to him that possibly she was acquiring her knowledge of it by telepathy from his own mind, and to test this theory he thought of an imaginary umbrella, which he pictured to himself as lying open on his friend's writing table. In a minute or so, the clairvoyant uttered a cry of astonishment, and exclaimed: "Why, how strange! There's a large umbrella open on the table!"