II—Chemistry. XIX—Food and Drink. XX—Medicine, Surgery and Sanitation. XXI—The Bicycle and Auto-mobile. XXII—The Phonograph. XXIII-Optics. XXIV—Photoeraphy. XXV—The Roentcen orX-Rays. XX VI-Gas Lighting. XXVII-Clvil Ensineerincr. XXVIII-Woodworking. XXIX-MetalWTorking. XXX—Fire Arms and Exniosives.… … Munn & Co., SCIENTIFIC AMERICAN OFFICE. Publishers, 361 BROADWAY, NEW YORK. 304 ^iciietttifi^ Sm^ticM*, November io, 1900. fTHOROUGHlmSPECnOMSl
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