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42 SCIOPTICON MANUAL. moving of the dissolver will very mysteriously dissolve one view into another. This effect is commonly produced with slides not spe- cially arranged for the purpose, but it is desirable that they should be of similar size and shape, and that they should be put in evenly, so as to cover the same spaco on the screen. Many slides are, however, selected and executed with special reference to their producing charming effects in dissolving. They are mostly arranged in pairs, as some view in summer and the same in winter, by day and by night, interior and exterior, in sunshine and in storm, or hu- manity in opposite moods. Sometimes the series are more extended, as the Seasons, the Yoyage of Life, &c., and sometimes they are in connection with chroma- tropes to represent volcanic action, conflagrations, fire- works, turning mills, &c. Suppose, for example, Saint Peter's, at Rome, is thrown upon the screen from .72, and a night view of the same is placed in Jj; then as the dissolver is changed, Saint Peter's with its surroundings continues on the screen, but an appearance of night comes over it; the windows glitter with a thousand lights, and the moon makes its appearance in the heav- ens. Now, suppose a chromatrope, suited to the pur- pose, is placed in .K, then as the change proceeds fire- works will rise from the darkness, and illumine the sky. The snow effect is produced by a strip, usually of silk, with pin-holes all over its surface, mounted on rolU ers within a slide, so that when the silk is rolling up, snowflakes appear on the screen to be falling. Let, for example, a farm-house scene be projected from R upon the screen, amid all the glory of summer vegetation; place the snow slide in L, and let an assistant slowly