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McIntosh battery and optical co., Chicago, ill., u. s. a. 25 mixing chambers of the lower jet through the keys on the lower part of the apparatus. H2 and O2 connect the dissolver with the upper jet. These tubes pass under the frame and up inside the body or cover to the upper keys H2 and O2, therefore their direction cannot be shown in the above illustration. The rod E regulates the distance of light from condensers in the upper lantern, and rod Ain the lower. R is the rod for raising or lowering the lights. 5 is the adjusting screw for centering the light from both lenses upon the same portion of the screen. The lower brass front C can be detached, and used with the solar apparatus. The upper brass front is adjustable by special screw movement to aid in registering perfectly with the lower. The optical parts are adapted to both sunlight and artificial light, and the oxy-hydrogen or ether-oxygen gases may be employed as preferred. The jets have the same mechanical construction, with screw adjustment for centering the light as the one described in part II. The McIntosh Biunial has the finest quality of condensers, mounted in brass, screw cells, and solid brass fronts. The lenses are our latest improved double combination achromatic, adapted to all distances ever required ; they are provided with rack and pinion and brass sliding tubes that will draw out, giving various focal lengths for different distances. The stages are arranged to take slides of all sizes, and to permit the attachment of various forms of apparatus employed in scientific demonstration. Some very fine effects may be produced by using the Stereopticon lens on one lantern, and the microscope attachment on the other. A microscopic object can thus be projected upon a diagram or scene. In physiological instruc- tion it is convenient to turn from the anatomical to the microscopic structure without waiting to change lenses. A variety of experi- mental work that will occur to the practical teacher, is facilitated by this apparatus. The simplicity of construction, durability of material, portability and perfect adaptation of every part to the work to be accomplished is appreciated at sight by all practical lantern men who have ex- amined it, and although it has been before the public but compara- tively a short time, the general recognition accorded it by competent judgesj* as the Best Dissolving Stereopticon yet made, and its ready sale are gratifying proofs of its merit.