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MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. come of years of experiment to perfect an instrument adapted to the higher grades of work, that could be furnished at a more moderate price than has hitherto been obtainable. The mechanism is perfect, and finely finished ; the arrangements for using all necessary accessories are ingenious and convenient, nothing essential being want- ing to make it fully equal to all the de- mands of professional microscopic in- vestigation. The base is broad and suf- ficiently heavy to secure firm and steady support; it is provided with soft rubber pads beneath to overcome the ordinary vibratory motion of the table and pre- vent scratching. The pillar and arm are of solid brass, and the joint connecting them has strong steel bearings. The arm can be removed from the base by loosening the thumbscrew at the back, and the working part of the instrument may be removed for use as a solar micro- scope, or with the stereopticon for projection. By reference to the diagram the parts are shown separated, K representing the instrument with stand S and draw-tube T removed; the adapter for connecting with Solar Apparatus or Lantern is beneath the stage, but not shown in cut. The device for connecting the stand and arm is independent of the joint, and does not inter- fere with its movement or weaken it in the least. This is a fea- ture of our Professional Microscope exclusively; the method of fastening R in arm A secures perfect solidity and freedom from motion or unsteadiness as complete as if they were united by a solid junction. The height of stand with draw-tube closed is 15 inches; with draw-tube open, 18 inches. Diameter of body- tube 1 % inches. The size of this tube adapts it to projection, or photography, as the rays of light passing through the objective are not cut off. It has the Society Screw and the broad Butter- field Gauge, which will admit of using objectives of low power with large lenses of wide angle, and also a large analyzing prism. Inside the body-tube is an extra spring-tube, carrying a nickel-plated draw-tube: this device insures an even, smooth movement of the draw-tube. The inside diameter of the latter is 1 % inches, length 7 inches; the lower end has the Society