Science . d complete attention byfocusing those two receptive senses, sight and hearing, onthe one subject. Illustrate the lessons with pictures, en-larged on a screen by the Bausch & Lomb BALOPTICON The Perfect Stereopticon The Balopticon is invaluable in theclass room and assembly hall. It projectsphotographs, drawinfifs, maps, coloredprints, specimens, etc., as well as perfect illumination and freedom fromtrouble makes the Balopticon an elScientassistant to the instructor. Write for more information. Bausch ^ Ipmb Optical (p. New York 552 St. Paul Street Washington ROCHESTER, N.
Science . d complete attention byfocusing those two receptive senses, sight and hearing, onthe one subject. Illustrate the lessons with pictures, en-larged on a screen by the Bausch & Lomb BALOPTICON The Perfect Stereopticon The Balopticon is invaluable in theclass room and assembly hall. It projectsphotographs, drawinfifs, maps, coloredprints, specimens, etc., as well as perfect illumination and freedom fromtrouble makes the Balopticon an elScientassistant to the instructor. Write for more information. Bausch ^ Ipmb Optical (p. New York 552 St. Paul Street Washington ROCHESTER, N. Y. San Francisco Chicago San Francisco London Leading American Makers of Photographic Lenses, Microscopes, Projection Apparatus(Balopticoru), Ophthalmic Lenses and UnstrumenSyPhotomicrographic Apparatus, RangeFinders and Gun Sights for Army and Navy, Searchlight Reflectors, Stereo-PrismBinoculars, Magnifiers, and other high-grade Optical Products ^ that gesTmy see --¥? -.^heitcr dnl farther-^^^^^^^^. SCIENCE—ADVERTISEMENTS GENERAL CHEMISTRY By Harry N. Holmes, Professor of Chemistry at Oberlin College. Cloth,octavo, 558 pages, $ A new text presenting the students viewpoint, simple, clear tlieory, fascinating applica-tions, maximum teaching aids. Published September 17, the book is already a success. It isbeing used at Yale University, Earlham College, Southwestern University, Whitman College,Rensselaer Polytechnic Institute, Hiram College, and Oberlin College. LABORATORY MANUAL OF GENERAL CHEMISTRY By Harry N. Holmes. Cloth, octavo, 115 text pages, no blank pages, $ exercises to accompany Professor Holmes excellent text-book, GeneralChemistry. QUANTITATIVE CHEMICAL ANALYSIS. Sixth Edition By Henry P. Talbot, Professor of Inorganic Chemistry at the Massachu-setts Institute of Technology. Cloth, octavo, 203 pages, $ The sixth edition is a complete rewriting of Professor Talbots textbook, which in its earliereditions has been used throughout the country
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