feats by means of a new "psychic force," which it was all-important for men of science to investigate thoroughly. The number of men and women who possess similar endowments, though generally in an inferior degree only, is very great, especially in the United States. Only one feature is common to them all--the state of trance in which they are enabled to produce such startling phenomena--in all other respects they differ widely, both as to the nature of their performances and as to their credibility. For, from the first appearance of media in spiritualistic circles, in fact, probably already in the exhibitions of the Fox family, delusion and willful deception have been mixed up with actual magic. Tables have been moved by clever legerdemain; spirit rappings have been produced by cunning efforts of muscles and sinews; ventriloquists have used their art to cause extraordinary noises in the air, and Pepper's famous ghosts have shown the facility with which the eye may be deceived and the other senses be taken captive. The most successful deception was practised by the so-called Davenport Brothers, whose well-known exhibitions excited universal interest, as long as the impression lasted that they were the work of invisible spirits, while they became even more popular and attractive when their true nature had been discovered, on account of the exquisite skill with which these juggling tricks were performed. The masters of physical science have amply proved that table-moving is a simple mechanical art. Faraday and Babinet already called attention to the fact that the smallest muscles of the human body can produce great effects, when judiciously employed, and cited, among other instances, the so-called Electric Girl, exhibited in Paris, who hurled a chair on which she had been sitting, by muscular power alone, to a great distance. The same feat, it is well-known, has been repeatedly accomplished by other persons also. Like muscular efforts are made--no doubt often quite unconsciously--by persons whose will acts energetically, and when several men co-operate the force of vibrations produced in a kind of rhythmical tact, becomes truly astounding. We need only remember, that the rolling of a heavily laden cart in the streets may shake a vast, well-built edifice from roof to cellar, and that the regular tramp of a detachment of men has more than once caused suspension bridges, of great and well-tried strength, to break and to bury hundreds of men under their ruins. Thus a few children and delicate women alone can, by an hour's steady work and undivided attention, move tables of such weight that a number of strong men can lift them only with difficulty. The only really new force which has ever appeared in this branch of modern magic is the Od of Baron Reichenbach; its presence and efficacy cannot be denied, although the manner in which it operates is still a mystery. In the summer of 1861 the German baron