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38 SCIOPTICON MANUAL. open threads of the texture is lost, it is better, when the instrument is invariably to bo placed in front, to cover the surface with whiting or paper, keeping it smooth by mounting it on a roller. When illumin- ated from behind, the screen should be wet, to tighten its texture and to make it translucent, and consequently luminous on the side towards the spectators. It can be wet and then stretched upon a frame, or first mounted and then sprinkled to saturation. For home use, a sheet may be stretched across the frame upon which the fold- ing doors of most modern houses are hung, the doors being thrown open at the commencement of the exhibi- tion. A waxed screen is often recommended, but it is little used on account of the difficulty of keeping it smooth and clean. An unmounted screen can be quickly put up in any room by procuring two strips of wood about two inches square, and long enough to reach from the floor to the ceiling; a side of the screen is tacked to each one of these strips, which are then stretched apart, and wedged up tightly between the floor and the ceiling. To widen the screen to more than nine feet, join the added width to each side, rather than bring a seam into the centre of the views. A fine picture from within, upon oiled muslin, stretched upon a frame, made to fit a show window, is always greatly admired by all the passers-by. Such a framed oiled screen, on a small scale, can also be conveniently used in parlors, or in the doorway leading out from the company. Working behind the screen has in many cases decided advantages, but the images can hardly be as bright by transmitted light, and other things being equal, it is better for the instrument to be in front.