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McAllister, Optician, 49 Nassau St., New Tokk. No. 401. Same as above, with clock work to move the lime $400 00 No. 402. Oxy-Hydrogen, or Drtimmond Light Stereopticon, for Dissolving Views. In Japanned Cases—Condensing Lenses,.4 inched diameter—High Power and Medium Power Magnifying Lenses, with Brass Hack adjustment for focussing. McAllister's new Slide Spring and Slop. Improved Safety Jets, Retort, Purifier, and largest size India Rubber Bag for the Oxygen. Copper Generator, and largest size India Rubber Bag for the Hydrogen. Becurfily packed in sirong locked box, with iron handle $200 00 No. 403. Same as No. 402, but with Achromatic Combination Magnifying Lenses $225 00 Each of the Oxy-Hydrogen Stereopticons is provided with an improved Dissolving arrange- ment, by which a great saving of the Gas is effected. Also with Bine Glass and Red Glass Diaphragms, for producing sunset and moonlight effects, colored ground for statuary, etc. The Achromatic Lenses make the picture clear, with the outlines sharply defined, and free from the prismatic, or rainbow colors, so often seen in pictures magnified with ordinary lenses. The high magnifying power is used when the screeu is obliged to be placed near the instru- ment. The low power, when the screen can be placed at a greater distance. The low power makes a picture of the same size as the high power, when the distance it doubled, thus adapting the instruments to halls of any size. The Copper Hydrogen Generator, which accompanies each of the above, is to be used for making the Hydrogen Gas, when giving exhibitions in places where there are no Public Gas Works. But where these exist, the Hydrogen Bag can be readily filled by making an attachment to a Burner. Each instrument is furnished with complete instructions for its management &&* For Prices of CHEMICALS, SCREENS, -3ic.j etc., See price list on page 43.