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Bausch 8c Lomb Optic a 1 Company be obtained. It is protected by a neat, sliding cover of hard wood and is adjustable so that the angle of reflection can easily be changed and the position of the image shifted as desired. This enables one to raise the image, as is often necessary, to clear the heads of those seated close to the screen. On account of its long focus it is not practical to mount the 25-inch focus lens in vertical position with the reversing mirror above it; this lens is fitted to the front of a metal, prism-shaped box carrying the reversing mirror, and the whole mounted as one piece on the top of the dark chamber, the lens being in the horizontal position in front of the mirror. All of the lenses for the projection of opaque objects are provided with rack and pinion adjustment for ordinary focusing and also with a spiral focusing adjust- ment to give greater latitude at varying distances from the screen. Projection with Vertical Museum Jars For the projection of specimens in vertical museum jars, we have devised a set of mirrors by which the specimen is made to appear on the screen in correct position. The mirrors are readily placed in proper position in the dark chamber and those who have used them for projecting anatomical specimens have been highly gratified with the results obtained. Microscopical Projection We recommend for use on the Convertible Balopticon our Large Projection Microscope of either the horizontal type, Figure 5, or the combined horizontal and vertical type, Figure 6, because of the unusually high efficiency in point of illumi- nation and the wide range of objectives that may be used. (For detailed descrip- tion see “Accessories.”) Either type attaches rigidly to the optical bed and instant interchange may be made between microscopical and the ordinary forms of projection. We have made extensive experiments with the projection microscope and are confident that these two instruments represent the highest type of microscope attachment on the market. c| Figure 7—Diagram of Illuminating System for Microscopical Projection with High Power Objectives: L=Light Source; C=Condensing System; L'=Inverted Image of L at Plane of Diaphragm; E=Substage Condenser; S=Object Slide; C'—-Image of Third Condensing Lens in Plane of S. The use in projection work of high power objectives, as the 4 mm and 3 mm, has been rather impractical in the past. We have adopted a modification of the Kohler illuminating system for this new Convertible Balopticon, however, by means of which entirely satisfactory results can be obtained with such objectives. 75