The famous Agrippa (_De occulta philos., Lugduni_, III. p. 13) quotes the former writer, and asserts that he also could, by mere effort of will, in a perfectly simple and natural manner convey his thoughts not to the initiated only, but to any one, even when his correspondent's present place of residence should be unknown. The most remarkable, and, at the same time, the best authenticated case of this kind, is that of a high German official mentioned in a scientific paper (_Nasse. Zeitschrift für psychische Aerzte_, 1820), and frequently copied into others. A Counsellor Wesermann claimed to be able to cause distant friends to dream of any subject he might choose. Whenever he awoke at night and made a determined effort to produce such an effect, he never failed, provided the nature of the desired dream was calculated to startle or deeply excite his friends. His power was tested in this manner. He engaged to cause a young officer, who was stationed at Aix-la-Chapelle, nearly fifty miles from his own home, to dream of a young lady who had died not long ago. It was eleven o'clock at night, but by some accident the lieutenant was not at home in bed, but at a friend's country-seat, discussing the French campaign. Suddenly the colonel, his host, and he himself see at the same time the door open, a lady enter, salute them sadly, and beckon them to follow her. The two officers rise and leave the room after her, but once out of doors, the figure disappears, and when they inquire of the sentinels standing guard outside, they are told that no one has entered. What made the matter more striking yet, was the fact that although both men had seen the door open, this could not really have been so, for the wood had sprung and the door creaked badly whenever it was opened. The same Wesermann could, in like manner, cause his friends to see his own person and to hear secrets which he seemed to whisper into their ears whenever he chose; but he admitted upon it that his will was not at all times equally strong, and that, hence, his efforts were not always equally successful. Cases of similar powers are very numerous. A very curious example was published in 1852, in a work on "Psychologic Studies" (Schlemmer, p. 59). The author, who was a police agent in the Prussian service, asserted that persons who apprehended being conducted to gaol with special anxiety, often made themselves known there in advance, announcing their arrival by knocks at the gates, opening of doors, or footsteps heard in the room set aside for examining new comers. One day, not the writer only, but all the prisoners in the same building, and even the sentinel at the gate heard distinctly a great disturbance and the rattling of chains in a cell exclusively appropriated to murderers. The next day a criminal was brought who had expressed such horror of this gaol, and made such resistance to the officials who were to carry him there, that it had become necessary, after a great uproar, to chain him hands and feet. It is well known that the mother of the great statesman Canning at one time of her life suffered under most mysterious though harmless nightly visitations. Her circumstances were such that she readily accepted the offer of a dwelling which stood unoccupied, with the exception of the basement, in which a carpenter had his workshop. At nightfall he and his workmen left the house, carefully locking the door, but night after night, at twelve o'clock precisely, work began once more in the abandoned part of the house, as far as the ear could judge, and the noise made by planing and sawing, cutting and carving increased, till the fearless old lady slipt down in her stocking feet and opened the door. Instantly the noise was hushed, and she looked into the dark deserted room. But as soon as she returned to her chamber the work began anew, and continued for some time; nor was she the only one who heard it, but others, the owner of the house included, heard everything distinctly.