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92 THE BOOK OF THE LANTERN. of water. The size while on the fire should be watched and occasionally stirred, but should not be allowed to boil. When melted, this size is well brushed into the calico, and allowed to dry. It will then be ready to receive its coating of white paint. This consists of whiting which has been soaked in water until it assumes the appearance of thick white mud. To this strong melted size must be added until the mixture is of the consistence of cream. It can be left now for some hours until it has become perfectly cold. At the end of that time it should have the appearance of very weak jelly,—a jelly which can be easily broken up by the paint brush. The frame being placed upright and properly secured, the workman commences at the top, working the well- charged brush up and down, and then horizontally, so as to avoid leaving any lines upon the surface, until it is all covered. If the sheet be unusually rough in texture, it will benefit by another cqat when the first is dry. When this painting operation is finished the nails must be drawn from the frame, and the sheet must be tacked on to a roller. This roller may be hung like a window- blind at the top of the room, and governed by a cord in the familiar manner. But if it is of large size,— say 12 feet across or more,—the roller is best placed at the bottom of the sheet, and made to roll up by cords upon its pro- jecting ends, and pulleys above like the drop scene at a theatre. It has often struck me as a deplorable oversight that halls where lantern lectures are of constant occurrence, are not fitted with permanent roll-up screens of this kind.