Among the things that "spirits" have been accustomed to do, since the days when they first made their appearance with the Fox sisters in America, are the lifting of tables and the ringing of bells and the assuming of visible forms. These are what is known as "materializations," and when I was a boy, and used to hear people talking about these things, there was always one test required: let the materializations manifest themselves upon recording instruments scientifically devised; let photographs be taken of them, let them be weighed and measured, and so on. Well, time has moved forward, and these tests have been met, and it appears that "materializations" are facts--although it is still as uncertain as ever what they are materializations of. An English scientist, Professor Crawford, has published a book entitled "The Reality of Psychic Phenomena," in which he tells the results of many years of testing materializations by the strictest scientific methods. When the medium "levitates" a table--that is, causes it to go up in the air without physical contact--it appears that her own weight increases by exactly the weight of the table. When she exerts any force, which apparently she can do at a distance, the recording instruments show the exact counter-force in her own body. The results of these investigations are calculated at first to take your breath away. It begins to appear that the theosophists may be right, and that we may have one or more "astral" bodies within or coincident with the physical body; and that under the trance conditions we mold and make over this "astral" body in accordance with our imaginations, precisely as a sculptor molds the clay. At any rate, our subconsciousness has the power to project from it masses of substance, and to cause these to take all kinds of forms, for example, human faces, which have been photographed innumerable times. Or the body can shoot out long rods or snaky projections, which lift tables, and exert force which has been recorded upon pressure instruments and weighed by scales.