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82 SOIOPT ICON MANUAL. that given for water colors : the same kinds of brushes, dabbers, and the same list of colors are used. The paints employed are sold in tubes; mastic varnish diluted with turpentine is used as a vehicle, sugar of lead as a drier. Comic or slip slides are generally painted on two pieces of glass, one of which is firmly fixed in the frame, the other movable; these glasses are so adjusted, that when the sliding glass is pulled out, an effect is produced which differs entirely from that shown when the glass is pushed in; as, for example, "The Windy Day;" the lady is seen passing along, fashionably dressed and equipped; the slip being drawn, she is shown in sad plight by the turned parasol, loss of false hair, bonnet, &c.; or a beautiful lily or tulip is seen; the slip is drawn, and a lovely fairy seems to float up from the flower. Chroma- tropes are constructed of two circular pieces of glass painted from the centre to the circumference of the circle with variously tinted rays and patterns, these are framed in brass frames, having grooves around them turned face to face, and when made to revolve reversely throw out beautiful and brilliant hues; according to the way in which they are made to turn, they expand or contract. Statuary gives a much better effect, if the glass around it is covered with some opaque paint. Lampblack ground very fine with mastic varnish, a few drops of oil of cloves, and then brought to the right consistency with turpentine, is perhaps the best, as it does not rub off. "Opaque," an article manufactured by Mr. Gihon, of Philadelphia, is more easily applied, being used with water, and answers every purpose. Figures which appear on the screen as black shadows, may be painted on the glass with these materials; or, to produce the same effect, designs may be cut from paper