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5(1 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. Screw, which allows the use of objectives of the lowest powers, having long working distance. The size of draw-tube is the same in all standard instruments, therefore an eye-piece of standard size can be used. The coarse adjustment is made with a very smooth-working rack and pinion of long range. The fine adjustment is unequaled ; it is without friction, and being ad- justable has a very delicate movement that is not liable to get out of order. It is made with a large, graduated milled head micrometer screw, which moves the entire body-tube parallel with the axis of the objective. The large, concentric, rotating stage consists of a brass frame, in which is set a circle of plate glass forming the upper surface of the stage. A slide carrier moves on this plate over the field of the lens, and is held in position by ivory points pressing upon the glass plate forming a part of the carrier; this gives very smooth motion, and reduces friction to a minimum. Beneath the stage are adjusting screws. The mirror-bar moves on a graduated circle, carrying the sliding mir- ror, diaphragm, sub-stage, adapter, etc The bar swings above the stage for illuminating opaque objects. The Durkee Electric Illuminator maybe attached to this bar if desired. Special atten- tion is called to the device already described, whereby the working parts are convertible into a solar or projection microscope. Photo- micrography, which is now popular with microscopists, becomes convenient with this microscope and a suitable camera. Instan- taneous photographs of living animalculae can be made with direct sunlight, therefore it is evident that an instrument that can be adjusted to this work without impairing its value as a monocu- lar, offers special advantages to the naturalist and investigators generally. We furnish to order objectives adapted to all the various forms of work to which this instrument can be applied, whether for individual study of minute structures and organisms, for projection, or photo-micrography.