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McAllister, Optictan, 49 Nassau St., New York. 9 No. 423. The Oxygen Apparatus. No. 422, with two of the Oxy-Calcium Jets, No. 421, and Dissolving Apparatus. By using this, a pair of the usual Dissolving Lanterns can be converted into an Oxy-Oalcinm Stereopticon $60 00 DISSOLVING VIEW APPARATUS WITH COAL OIL LAMP, No. 425. A Pair of Dissolving View Phantasmagoria Lanterns, in Japanred Cases, 10 by 8 inches square, and 16 inches high. Condensing Lenses 4 inches in diameter; high power and medium power Magnifying Lenses ; Brass Rack work adjustment for focussing. McAllister's new Slide Spring and Stop. Coal Oil Lamps, with apparatus for producing the Dissolving effect. Packed in box 24 inches square, with hinged lid, lock and key and handles. The lid of the Box serves for a platform when exhibiting $7500 No. 426. Condensing Lenses, 4 inches diameter. Plain finish. Slip Tube Adjustment, for focussing $55 CO No.' 427. Same as No. 425, fine finish, with Condensing Lenses 3£ inches diameter $65 CO No. 428. Condensing Lenses 3£ inches diameter. Pla'n finish. Slip Tube Adjustment, for focussing $45 CO To produce the Dissolving effect requires two lanterns arranged on a stand, as shown in the engraving. Each Lantern turns upon a pivot in front. Incline both Lanterns apart at the rear to such an angle that the circle of light from each shall fall precisely upon the same spot on the screen. There is in front of the pair of lanterns a diamond-shaped shade, which slides in a groove, and is so proportioned that when the wide part is in front of the tube ot one lantern, the pointed end will not quite reach to the front of the tube of the other lantern. Having placed a slider in each lantern, slide the shade along the grove, by the hand, alternately from right to left, and leit to right; and it follows, that as soon as the shade begins to cover the image proceeding from one lantern a corresponding portion of the image proceeding from the other lantern is thrown upon the screen. The movement should be nlow and regular, and the paintings will impercep- tibly and beautifully dissolve, the one into the other. It is of much consequence that the paintings are plaeed precisely in the centre of the lenses. so that they may fall directly upon each other when the change is made. The paintings also must each be mounted in a separate slider; and as the space between the lanterns is slight, (see engraving,) the slider must not be more than 7 inches in length. All sliders, therefore, which are over 7 inches in length cannot be used to produce the dissolving effect.