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42 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. Microscope Projection it is necessary to insert a secondary condense*, in the sub stage ring of the microscope attachment before fastening it to draw tube E. The Solar part of this Combination consists of a mirror, moved by spur-wheel gears in such a way that a beam of sunlight reflected from it can be kept in the same direction all day, if needed so long. The room in which it is used should have, preferably, a southern aspect, although an east or west one will answer for a few hours daily. The frame, T, should exactly fit into the window frame when the sash is raised or lowered (according as the lower or upper part of the window is most convenient), and the light should be excluded from the room. To Darken the Room. Any plan may be adopted that will ex- clude the light. In our exhibition room the windows have opaque shades, and heavy canton flannel curtains draped back, to admit light. To darken the room the shades and curtains are lowered in a moment. We find this very convenient, and it is a method well adapted to the class-room. To use the Solar as a Stereopticon. Fix the frame as already described, and revolve the mirror until a beam of light is thrown through the opening in the frame upon the center of the screen ; fasten C to the frame, and attach L to the sliding tube E (in place of microscope attachment K, shown in cut). The sliding tube should be moved back so as to shorten the focal distance between C and L as much as possible. Insert the slide (inverted) in opening A and its magnified image will appear on the screen. If the outlines are not distinct adjust the focus by means of the wheel on L. To use as a Solar Microscope. Remove L and attach K as shown in cut. The focal distance between condenser and the mi- croscope objective needs to be greater than when the stereopticon lens is used, therefore draw out E two or three inches (this distance varies with different objectives), until a bright, white disk appears on the screen. Insert the slide upon which the object to be examined is mounted inside the spring clips ss, and focus the image on the screen by means of c. When very delicate specimens are to be ex- amined, it is advisable to employ an alum tank to absorb the heat rays. To transform the Solar into a Monocular Microscope. Remove K, and fasten it upon the stand S by the screw b. Slide the draw tube T, which carries the eye-piece into the solar tube K, and it is ready for use. The stand is solid and carefully made, and can be used with objectives of high power. This microscope has the Society Screw and the broad Butterfield Gauge, so that any objectives having the same can be used with it.