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126 SCIOPTICON MANUAL. "For a parlor or school exhibition, it may well take the place of the far more troublesome oxy-calcium lan- tern, which it rivals in efficiency. " There are many details of construction which are of very ingenious and efficient character, among which we would specially notice the slide for pictures, by which, one picture being in use, another may be removed and exchanged, and then, by a single movement, brought into the field, while the other is in like manner ready for substitution." THE MAGIC LANTERN FROM 1650 TO 1870. [From the Scientific American.] "The invention of the Magic Lantern dates back to 1650, and is attributed to Professor Kircher, a German philosopher of rare talents and extensive reputation. The instrument is simple and familiar. It is a form of the microscope. The shadows cast by the object are, by means of lenses, focused upon something capable of reflection, such as a wall or screen. No essential changes in the principles of construction have been made since the time of Kircher; but the modern improvements in lenses, lights, and pictures have raised the character of the instrument from that of a mere toy to an apparatus of the highest utility. By its employment the most wonderful forms of creation, invisible, perhaps, to the eye, are not only revealed, but reproduced in gigantic proportions, with all the marvelous truth of nature itself. The success of some of the most celebrated demonstra- tions of Faraday, Tyndall, Doremus, Morton, and others, was due to the skilful use of the Magic Lantern. As an educator, the employment of this instrument is rapidly extending. No school apparatus is complete without it;