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50 SCIOPTICON MANUAL. fitted up his concave mirror in a box containing the figures of his devils, and that thk box with its lights was carried home with the party, we can easily account for the declaration of the boy, ' that as they were going home to their houses in the quarter of Banchi, two of the demons whom we had seen at the amphitheatre went on before us leaping and skipping, and sometimes running upon the roofs of the houses, and sometimes upon the ground.' " "We could hardly, in this enlightened age, attain to the brilliant success of frightening a "pure immaculate boy" out of his senses with "smoke and shadow," even were it a laudable undertaking. The delirium tremens, in a somewhat similar way, will doubtless continue to be hard on older and wayward boys who take to their cups, but be it ours to please and instruct, and that, in a more excellent way. A jet of steam could be con- veniently arranged for the " ghost" experiment, but for the most part, a wet screen is better than smoke, and effects, not only startling, but truly beautiful, can be pro- duced in the way described. CHAPTEE IV. PICTURE SLIDES. A LARGE number of movable slides, and some others of value, are still painted entirely by hand, but the great part of simple slides now in market are produced by photography. There are two classes of photographic transparencies for the lantern, viz.: instantaneous and other views direct from nature, and reproductions of ancient and modern engravings, or paintings. A great part, espe- cially of the latter, are beautifully colored by skilful artists, and mounted in a round form in wooden frames.