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Bausch & Lomb Optical Company those at which microscopical work is most commonly carried on in the lecture room and are measured from the objective to the screen. Mechanical Excellence Mechanically our projection microscopes have been equally well perfected. They are provided with adjustments, both coarse and fine, which are marked by careful workmanship and very accurate movements, so esential to satisfactory micro-projection. Microscopical projection will be more effective if an aluminum screen is used, because of the greater brilliancy of the image thus afforded. Projection of Horizontally Placed Objects by Transmitted Light It is often desirable for certain physical, chemical and biological demonstrations to have the objects to be projected in a horizontal position. Among these may be mentioned such objects as a glass dish of iron filings set in commotion by a magnet or by vibrations of the air, as those caused by a pulsating violin string; also different animal organisms moving in water, or drooping plant formations. To accomplish this we furnish a simple vertical attachment, the principle of which is apparent from the accompanying diagram. B is the beam of parallel light, which has come from the illuminant through the two rear lenses of our triple condensing system. It strikes the inclined mirror, M, in the dark chamber, E, and is reflected vertically through the plano-convex condensing lens, C, placed over the opening in the top of the dark chamber. The object to be projected is placed on the flat surface of the condensing lens, C, and the light rays focused by C in the projection lens, P, which is supported by the upright standard, S, image the object on the second inclined mirror, M 1 , which directs the image toward the screen. 12