Modern Magic: A Practical Treatise on the Art of Conjuring
Professor Hoffmann578A duplicate bird is beforehand placed in the hollow die, which is then closed, and placed either upon the servante or in one of the secret pockets of the performer, who, having borrowed a hat, secretly slips the hollow die into it, and places it on the table mouth upwards. He now brings forward and offers for inspection the solid die, the cover, and the birdcage, placing the latter when returned upon his table, rather towards the hinder edge. “The die,” he carelessly remarks, “I will place in this hat” (suiting the action to the word); “or, better still, I will place it upon this tray, so that you may be able to keep sight of it throughout the trick.” So saying, he again takes out apparently the same, but really the hollow die, and places it on the tray with the moveable side downwards, in such manner as to hook the turned-over portion of that side into the open edge of the corresponding square upon the tray, and places the cover over it. Handing the tray to his assistant, he proceeds to cause the disappearance of the birdcage from the handkerchief, as already described. This done, he advances to the tray, and lifts the cover with the hollow die within it, first, however, sliding away cover and die together towards the opposite end of the tray (see Fig. 256), and thereby leaving behind upon the centre of the tray the moveable slide, the interior of which is japanned so as to correspond with the centre pattern of the tray, and thus does not attract any attention.

