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1 McIntosh battery and optical co., Chicago, ill., u. s. a. INTRODUCTION. I T is supposed that the Magic Lantern originated early in the 13th century, when it was employed to excite the awe and credulity of the public by so-called magicians. This continued to be its prin- cipal use until within the last thirty years. Whereas, formerly, those skilled in arts and sciences sought craftily to preserve their knowledge a secret, except from a chosen few, it is a characteristic of the present age that the man of science seeks to share the result of his labors with his fellow man. The Magic Lantern has been modified, improved and re-named so that the stereopticon of today bears little resemblance to the crude instrument which excited the wonder of the ignorant and enabled the unscrupulous to play upon their superstitious fears in the ages that have passed away. The scientific investigator, the educator, the lecturer and he who simply caters to the higher amusement of the public, find in the stereopticon an indispensable aid. In its improved form most delicate investigations into chemical, physical, electrical and pathological phenomena are possible; and what is of most importance, the method of conducting such research, and its immediate results can be shown to an audience as easily as to a single individual. The educator can illus- trate in the most effective manner by its aid, Physiology, Botany, Natural History, Chemistry, etc. Problems can be demonstrated^ drawing lessons given, maps, diagrams, formulas and a great variety of exercises suitable for the class room can be displayed in a way to impress them upon the memory more firmly than by the older methods. Those who have made use of the Solar Microscope and Stereopticon largely for purposes of instruction are enthusiastic in its praise. Literary Colleges use it. A gentleman at the head of one of the largest institutions in the country where a stereopticon is con- stantly used, writes thus: “After the Stereopticon, the Black- board seems almost good for nothing. I wonder how we have managed so long without it.’’ Medical Colleges. We have supplied many medical colleges with a complete outfit for using the Microscope and Stereopticon with Solar and Artificial light. This method of illustrating medical lectures is very popular with the students, and insures full seats during the hours when this apparatus is employed.