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BCIOPTICON MANUAL. 35 without jumping them about. The stage o slants down to the condenser, to keep the slides down close to it. Take the slides out with the left hand as others are pushed into place, so as to leave none of the white disk visible, and put them in their box as before. A slide standing endwise between those which have been used and those which have not, will keep them apart. As photographers are giving increasing attention to preparing slides, there is an increasing proportion in the market of the size of half a stereoscopic view, or 3J inches square, bound with narrow binding. For these a wooden stage 9 inches long is attached to o o', so that, without crowding a picture out at the end, its successor may be pushed into its place, by the finger following to where the cylinder and stage intersect; with the left hand at the button attached to the back stop we may: 1. Close stop. 2. Slide in the picture. 3. Uncover — so that in the time of counting three we have changed the scene without any visible movement. This, well man- aged, is better than dissolving views poorly managed. Tanks for insects, fish, chemical experiments, &c., &c., slide into the stage as easily as pictures. The stage being open at the top, with no bulky lantern case to ob- struct it, is peculiarly suited to all such operations. A slender wire in the direction r 0', answers the pur- pose of a long rod pointing upward on the screen to explain the representations. The simplicity and completeness of the Sciopticon are more evident in practice than may seem while consider- ing so wide a range of details and contingencies. The advantage of having an instrument so completely under one's hand is not only felt by the operator, but the smoothness it gives to the exhibition is appreciated by spectators.