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SCIOPTICONMANUAL. 43 roll it up while the dissolver passes over; the snow shows plainer and plainer, till nothing but the falling snow appears. Now place in H the same view in winter and turn back the dissolver; the storm subsides, and the farm-house scene again appears in the morning light, covered with the newly fallen snow of the win- ter's night. To bring out statuary on a blue ground, a slide of blue glass, and usually one of red glass also is used. Change any scene, first into a red disk, then the red into blue, and then let a piece of statuary slowly come out into the blue ground, while the blue becomes darker and darker, till it ends in a blackness which seems to add vigor to the representation. A beautiful effect is produced by a wheel chromatrope, used continuously in one of the lanterns, while a series is shown in the other, turning it inward and outward alternately, as the dissolving proceeds. It thus seems to suck up the vanishing scene as in a maelstrom, and to bring out its successor with scintillations of colored lights. A pleasing effect is produced by showing a series of views in one lantern, and a veranda, or some appropriate design with opaque centre, with the other. If in adopt- ing this suggestion, the veranda be focused for the edges of the field, and the view focused for the centre, a flat field is obtained over the entire disk. In this case, and in all cases when light from both lanterns is to appear, the dissolver is slipped up an inch higher, and kept in position as in Fig. 16. The slow or dissolving process may become monoto- nous, and it is not always appropriate. We hardly like to see "Pilgrim" in his "Progress" fading away, while his double by his side is slowly growing in strength and