CONTENTS. 



Page 



Art. XIV. — Optical Constants of the Human Eye for differ- 

 ent Colors ; by C. S. Hastings ■ 205 



XV. — Notice of the Discovery of a New Dike at Ithaca, 



N. Y. ; by V. H. Barnett . _ _ 210 



XVI. — Dumortierite : by W. T. Schaller 211 



XVII. — Crystallography of Lepidolite ; by W. T. Schaller 225 

 XVIII. — Machine-Made Line Drawings for the Illustration 



of Scientific Papers ; by R. A. Daly 227 



XIX. — lodobromite in Arizona ; by W. P. Blake 230 



XX. — Autophytography : A Process- of Plant Fossilization ; 



by C. H. White._' _ 231 



XXI. — Oxidation of Sulphites by Iodine in Alkaline Solu- 

 tion ; by R. H. Ashley 237 



XXII. — Billings Meteorite : A new Iron Meteorite from 



Southern Missouri ; by H. A. Ward 240 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Atomic Weight of Iodine, G. P. Baxter : Double 

 Silicides of Aluminium, Manchot and Kieser : Europeum, Urbain and 

 Lacombe, 243. — Use of Calcium Carbide as an Explosive in Mining, 

 Guedras : Silicon-fluoroform, Euff and Albert : Double Cyanides of 

 Copper, Gross mann and Forst, 244. — Occurrence of Radium and Radio- 

 active Earths, F. Giesel : N-Rays, E. Gehrcke : Photography of N-Rays, 

 G. Weiss and L. Bull ; Spectra of Electric Discharges in Cooled Geissler 

 Tubes, E. Goldstein : Dependence of the Ultra-Red Spectrum of Carbonic 

 Acid upon Pressure, C. Schaefer, 245. — Electromagnetic Waves in the 

 Visible Spectrum, F. Braun : Damping Galvanometer Deflections, W. 

 Einthoven : Possible Variation in Solar Radiation, 246. — Terrestrial Mag- 

 netism, L. A. Bauer, 248. — Introduction to the Study of Spectrum 

 Analysis, W. M. Watts, 249.— Reflecting Telescope : Theory of Optics, A. 

 Schusteb, 250. — Elektrische Bogenlicht, W. B. von Czudnochowski, 251, 



Geology and Mineralogy — Treatise on Metamorphism, C. R. Van Hise, 251. 

 — United States Geological Survey : Geology of Perry Basin in South- 

 eastern Maine, G. O, Smith and D. White, 256.~Prelimina7-y Report on 

 the Arbuckle and Wichita Mountains of Indian Territory and Oklahoma, 

 J. A. Taff, 257. — Oldest Sedimentary Rocks of the Transvaal, F. H. 

 Hatch : Maryland Geological Survey, 258. — Pal83ontologia Universalis : 

 Melting Points of Minerals, A. Brun, 259. — Mineral Resources of the United 

 States, 1903, D. T. Day, 260.— Elements of Mineralogy, Crystallography 

 and Blowpipe Analysis, A. J. Moses and C. L. Parsons, 261. 



Miscellaneous Scientific Intelligence — Report of S. P. Langley, Secretary of 

 the Smithsonian Institution : Report of the Superintendent of the Coast 

 and Geodetic Survey, 261. — Scottish National Antarctic Expedition : Nat. 

 Academy of Sciences : Amer. Museum Journal, 262. — Reflections suggested 

 by the new Theory of Matter, A. J. Balfoub : Ideals of Science and Faith, 

 J. E. Hand : Long-range Weather Forecasts, E. B. Garriott : English 

 Medicine in the Anglo-Saxon Times, J. F. Payne, 263. — Studies in Gen- 

 eral Physiology, J. Loeb : Early Stages of Carabidae, G. Dimmock and F. 

 Knab, 264. 



Obituary — Alpheus Spring Packard. 



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