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MCINTOSH BATTEBY AND OPTICAL CO., CHICAGO, ILL., H. S. A. 93 ILLUSTRATIONS FOR PROJECTION. I T would be impossible to include within the limits of a cata- logue a complete list of all the slides prepared for projection by the various manufacturers. We append lists which illustrate most of the subjects to which this art is applied, and can furnish in addition any special series offered by other houses, at their advertised price. Photographs from Nature are the most popular because they are always beautiful and absolutely correct representations of places and objects. These are usually prepared on glass plates averaging 3^ x 4 inches in size, protected by a thin glass cover and bound with black paper. Fine Colored Photographic Views. Those included in our lists are made only by the best artists; |hey are carefully sealed, to protect the colors from the action of the atmosphere, and inclosed in wood frames 4x7 inches. We have not quoted the cheaper grades of colored views, which possess neither beauty nor merit, but only those which are artistic and pleasing to a re- fined taste. Photographs of Engravings, Diagrams, and of Micro- scopic Objects can be furnished in greatest variety. They are mounted in the same style as the photographs from nature. Many diagrams can be made by the instructor by covering a suit- able plate of glass with a thin film of varnish, paraffine, starch or soap and drawing the design with a sharp pointed instrument, through the film. The light can pass through only those lines where the film is removed. Views of Statuary are each upon square glass slides 3 x 4 inches in size, with black background. Chromatropes are 3 inches in diameter, in frame 4 inches wide by 12 inches long. They produce the effect of the kaleid- oscope. The pictures are produced by brilliant designs painted upon two circular glasses, and the glasses made to rotate in dif- ferent directions. An endless variety of changes in the pattern are caused by turning the wheel, sometimes slowly, then quickly, backward and forward. Dissolving Views consist of plain or colored slides and re- quire two lanterns to produce the finest results. With these it