Another medium shows you a blank canvas, and, _almost_ without taking it out of your sight, produces an elegant, and still wet, oil painting on it. The painting was there from the start, of course, but a blank canvas was lightly gummed over it, and all the conjuring the medium had to do was to strip off this blank canvas while your attention was diverted. Mediums know that their sitters are profoundly impressed if the paint is "still wet." I have heard Spiritualists stubbornly maintain that this proves that the painting had only just been done, and done by spirit-power, since no man could do it in so short a time. It is a good illustration of the ease with which they are duped. The picture may have been painted a week or a month before. Rub it with a little poppy oil and you have "wet paint." Mr. Carrington's _Physical Phenomena of Spiritualism_, one of the richest manuals of mediumistic trickery, has a number of these picture-frauds. A painting is, when thoroughly dry, covered with a solution of water and zinc-white. It is then invisible, and you have "a blank canvas." The picture comes out again by merely washing it with a sponge. In other cases a painting is done in certain chemicals which will remain invisible until a weak solution of tincture of iron is applied; and it may be applied to the back of the canvas. The medium, Carrington suggests, begs the sitters to sing "Nearer, my God, to Thee," to drown the noise, while his confederate creeps behind the canvas and sprays it with the solution. The picture dawns before their astonished eyes. Perhaps the best illustration is one that Carrington gives in his _Personal Experiences_, to which I must send the reader for the full story. Two spinster-mediums of Chicago had a great and profitable reputation for spirit-painted photographs. I take it that their general air of ancient virtue and piety disarmed sitters, who are apt to think that a _fraudulent_ medium will betray himself or herself by criminal features. You took a photograph of your dead friend, and asked that the spirits might reproduce it in oils. The medium studied it, and made an appointment with you at a later date. Perhaps the medium then studied it again, and made a further appointment. On the solemn day the medium held a blank canvas up to the window before your eyes, and gradually, first as a dim dawn of colours, then as a precise figure, the picture appeared on the canvas. Carrington suggests that she held up to the window two canvases--a thin blank canvas a few inches in front of the prepared picture. By deftly and slowly bringing these together with her fingers she brought about the illusion; and only a little ordinary sleight of hand was required to get rid of the blank canvas.