Science . th, $ CHAMBERLAIN. Textbook of OrganicChemistry, xliii + 959 pages. Cloth,$ By Joseph P. Chamberlain, (Mass. Agric. Coll.). HAMPSHIRE. Volumetric Analysis. 3dEdition. Cloth, $ By C. H. Hamp-shire, (London). HACKH. Chemical Reactions and TheirEquations. Cloth, $ By Ingo W. , (San Francisco). ROUGIER. Philosophy and the New Phys-ics. XV 4- 159 pages. Cloth, $ ByLouis Rougier (Paris). Translation byMorton Masius, (Worcester). BOOTH. Radiant Energy and the Ophthal-mic Lens. 230 Illustrations, xxvii + 226pages. Cloth, By Freder
Science . th, $ CHAMBERLAIN. Textbook of OrganicChemistry, xliii + 959 pages. Cloth,$ By Joseph P. Chamberlain, (Mass. Agric. Coll.). HAMPSHIRE. Volumetric Analysis. 3dEdition. Cloth, $ By C. H. Hamp-shire, (London). HACKH. Chemical Reactions and TheirEquations. Cloth, $ By Ingo W. , (San Francisco). ROUGIER. Philosophy and the New Phys-ics. XV 4- 159 pages. Cloth, $ ByLouis Rougier (Paris). Translation byMorton Masius, (Worcester). BOOTH. Radiant Energy and the Ophthal-mic Lens. 230 Illustrations, xxvii + 226pages. Cloth, By Frederick Booth,Introduction by Whitefield Bowers, (Indiana). P. BLAKISTONS SON & CO.,Publishers : : : Philadelphia ElectricalMeasuring Instruments for Physicistsand Physical Chemists Equipments suitable for researchand industrial laboratories We solicit inquiries Leeds & Northrup Co. Electrical Measuring Instruments 4901 Stenton Ave. Philadelphia, Pa. Freas Constant TemperatureLaboratory Apparatus. Freas Tube Furnace,Supplied by all dealers In Laboratory apparatusThere Is a FREAS Oven, Incubator and WaterBath for your Laboratory needs. Write fordescriptive literature. Manufactured by The Thermo Electric Instrument Co. S John«on Street Newark, N. J. SCIENCE Friday, August 26, 1921 The American Association for the Advance-ment of Science: Whose Business is the Public Health: Pro-fessor Frederick P. Gat 159 The Aboriginal Population of California:Professor A. L. Kroebek 162 The Centenary of the Birth of Hermann vonHelmholtz: Dr. T. C. Mendenhall 163 Scientific Events:Deaths of German Men of Science; Prog-ress in the Work of Mapping the UnitedStates; The Tongass National Forest; TheEoosevelt Wild Life Memorial 165 Scientific Notes and News 167 University and Educational News 169 Discussion and Correspondence: The Temple Hill Mastodon: Sherman A More Phenomenal Shoot: W. a Phytophthora Parasitic onPeony: Dr. H. W. Thurston, Jr., and Orton 170 Fair Weather Pr
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