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SCIOPTICON MANUAL. 51 Some idea of the value of photography, associated with the magic lantern, as an educational instrument, may be gathered from the fact that as the camera has now penetrated to almost every habitable part of the globe, the physical peculiarities of every country, to- gether with lifelike portraits of their inhabitants, and the form and arrangement of their dwellings, may be obtained in miniature, and reproduced as large as life. Photographs of the sun and moon in various phases, and partially and totally eclipsed, also the fixed stars and nebulae, have been obtained and employed for lecture illustrations. Enlarged photographs of microscopic ob- jects have also been obtained, and these again still further enlarged to 8 or 10 feet in diameter, so that, in fact, a diatom no larger than a grain of sand may be shown of such a size in the lecture-room that a large audience may together examine its details with perfect comfort. The productions of the most celebrated painters and sculptors may be shown with equal facility, as well as maps, hymns, music, &c., so that an entire school may learn or sing together. THE STANDARD SIZE FOR LAXTJBRX SLIDES. The ordinary wooden frame for the lantern picture is 7 inches long, 4 inches wide, and f of an inch thick, with a circular opening of 3J inches to admit the picture- glass and its protecting glass cover, and 3 inches in the clear. Pictures 3i inches square are also mounted in frames of the same size, leaving 3 inches square in the clear. Pictures 3i inches square, with their protecting glass covers, are also bound with narrow binding, and may be slid along into place in the grooves of a station- ary frame, so as to show 3 inches square.