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ยป HALLS ILLUSTRATED CATALOGUE OP Oxy-Hydro-Calcium Stereopticons. Owing to the present very high price of good alcohol, we have been induced to contrive a plan for burning house gas in place of that fluid, thereby diminishing the running expense very material- ly, and at the same time lessening the trouble of setting up and operating the Stereopticon, and producing a very much more bril- liant illumination of the pictures. With this arrangement we have the very nearest approach to the oxy-hydrogen light that is pos- sible short of the oxy-hydrogen apparatus itself. Setting up and Operating the Oxy-Calcium Stereopticon. Having made the gas, filled the lamp in the Stereopticon with alcohol, aud carefully cleansed all the lenses, put a cylinder of un- slacked lime, one and a half inches long, and half of an inch in diameter, in the brass cup at the back of the wick, we are now ready to commence the exhibition. Place the bag on the floor in front of the instrument ; bring the gutta-percha tubing under the table, screw one end to the back of the lamp, the other being attached to the bag ; or, in the dissolving view apparatus, instead of being attached to the lamp, that end is screwed to the middle of the arched pipe, which is attached to the lamp on each side of the instrument ; lay the press board on the bag, and put on it about one hundred pounds of stones, bricks, or any other heavy articles, light the lamp or lamps, and open the stop-cocks between it or them and the bag ; the gas will then be forced through the small jet in front of the wick and drive the flame of the lamp against the lime, which must be brought as near as possible to the wick ; the lamp should burn with a pretty large flame to produce the most brilliant effect. If the oxygen, in coming from the jet, should strike against the wick and not reach the lime, the wick must be spread apart to allow a free passage of the gas to the lime ; the wick, however, should be kept in a body as much as possible, and should be pressed a little towards the jet. If the gas, as it comes from the jet, should make an unpleasant hissing noise, it will be owing to some of the little fibres of the wick obstructing the flow of the gas to the lime; they should be re- moved at once. The light now being brilliant, the screw which holds the lamp to the bottom of the instrument is loosened, and the lamp moved in or out until the proper distance from the lenses is found ; the circle on the screen will then be clear to the edge. Now place a