Vitalize your lectures, by showing pictures of the processes you are In Chemistry, you can show industrial processes which In Botany and Zoology; Life Cycles, Ecology, Dissections, In Geology; Weathering, Work of Water, Rivers and In Physics; Mechanics, Heat, Sound, Light, Magnetism and Electricity. Lantern slides to illustrate all the above and much more are listed in our catalog S. And to project these slides there is no lantern like the Automatic Sciopticon, priced, complete with 400 Watt Gas-filled Mazda lamp, at $38.00. Write for circulars and catalogs and submit your projection problems. MCINTOSH STEREOPTICON COMPANY 410 Atlas Block, CHICAGO, ILL. Does the work of six ordinary balances. Two models: 500 or 1500 gram capacity. For further information write Detroit Automatic Scale Co. Please mention School Science and Mathematics when answering Advertisements. OREN E. FRAZEE... Α Abrasives, High-Grade. U. S. GEOL. SURVEY. Acoustic Attraction and Repulsion. C. C. KIPLINGER. 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