There is one more phase of Home's mediumship, the moving of heavy pieces of furniture without physical contact, that must be spoken of. In mentioning it, Dr. Max Dessoir, author of the "Psychology of Conjuring,"[1] says: "We must admit that _a few_ feats, such as those of Prof. Crookes with Home, concerning the possibility of setting inanimate objects in motion without touching them, _appear_ to lie entirely outside the sphere of jugglery." In the year 1871, Prof. William Crookes, (now Sir William Crookes) Fellow of the Royal Society, a very eminent scientist, subjected Home to some elaborate tests in order to prove or disprove by means of scientific apparatus the reality of phenomena connected with variations in the weight of bodies, with or without contact. He declared the tests to be entirely satisfactory, but ascribed the phenomena not to spiritual agency, but to a new force, "in some unknown manner connected with the human organization," which for convenience he called the "Psychic Force." He said in his "Researches in the Phenomena of Spiritualism:" "Of all the persons endowed with a powerful development of this Psychic Force, and who have been termed 'mediums' upon quite another theory of its origin, Mr. Daniel Dunglas Home is the most remarkable, and it is mainly owing to the many opportunities I have had of carrying on my investigations in his presence that I am enabled to affirm so conclusively the existence of this force." Prof. Crookes' experiments were conducted, as he says, in the full light, and in the presence of witnesses, among them being the famous English barrister, Sergeant Cox, and the astronomer, Dr. Huggins. Heavy articles became light and light articles heavy when the medium came near them. In some cases he lightly touched them, in others refrained from contact. [Illustration: FIG. 8. CROOKES' APPARATUS.] The first piece of the apparatus constructed by Crookes to test this psychic force consisted of a mahogany board 36 inches long by 9-1/2 inches wide and 1 inch thick. A strip of mahogany was screwed on at one end, to form a foot, the length being equal to the width of the board. This end of the board was placed on a table, while the other end was upheld by a spring balance, fastened to a strong tripod stand, as will be seen in Fig. 8. "Mr. Home," writes Prof. Crookes, "placed the tips of his fingers lightly on the extreme end of the mahogany board which was resting on the support, whilst Dr. A. B. [Dr. Huggins] and myself sat, one on each side of it, watching for any effect which might be produced. Almost immediately the pointer of the balance was seen to descend. After a few seconds it rose again. This movement was repeated several times, as if by successive waves of the psychic force. The end of the board was observed to oscillate slowly up and down during the experiment.