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^[[3]] from above. The brass frame rests upon a grooved bed-plate which permits a lateral movement of the frame. This lateral motion is [[strike through]] o[[/strike through]] controlled by a screw operated by means of a second milled head in convenient proximity to the one giving the to and fro motion. As in the other instrument the specimens and nearly all parts of the mechanism are enclosed in a box secured by a lock, the only exposed parts being the microscope and the two milled heads controlling the motion of the slides. The advantages of this form of apparatus are that the usual glass slide 3 inches long by 1 inch wide, upon which microscopic objects are usually mounted, may be used, and especially that the focal distance is not disturbed by differences in the thickness of glass used. The only disadvantage is that the mechanism is somewhat more delicate and complicated than in the other instrument, and requires some little protection from the thoughtless violence of curious children. Microscopes [[strike through]] made after the model[[/strike through]] ^[[copied from the original]] here described have been several years in use [[strike through]] at the Army Medical Museum[[/strike through]], and no irremediable difficulties have been found in the way of their perfectly successful operation. It is safe to say, from present experience, that these methods of installation of microscopic exhibits promise[[strike through]]s[[/strike through]] to open a new and interesting field of observation and study to [[strike through]] thousands of[[/strike through]] Museum visitors.