CO N T K N T S. 



Art. XLIIL— Emission of Electrons by Metals under the 



Influence of Alpha Rays ; by H. A. Busistead 403 



XL1Y. — Some Minerals from Beaver County, Utah; by B. 



S. Butler and A-.'. T. Schaller 418 



XLY. — Method of Determining the Density of Minerals by 

 means of Rohrbach's Solution having a Standard Refrac- , 

 tive Index ; by H. E. M krwin 425 



XLVI. — Quartz and Fluorite as Standards of Density and 



Refractive Index ; by II. E. Merwin .... 429 



XLVII. — William$onian Tribe ; by (x. R. Wieland . 433 



SCIENTIFIC INTELLIGENCE. 



Chemi Physics — Arsenides of Iron and Manganese. Hilpert and 



Dieckmakn : Enrichment of Radio-active Substances by Adsorption, 

 Ebler and Fellner : Fl am, O. Rt ; 



A Constituent of Mineral Coal, A. PiCTET and L. RamSEYER, 40L — Techni- 

 cal Analysis of Brass and the Non-ferrous Alloys, AV. B. Price and R. K. 

 Meade ; Allen's Commercial Organic Analysis : Electro-Analysis. E. F. 

 Smith, 468. —Disintegration Products of Uranium, G. N. Antonoff, 469 — 

 Method of making Visible the Paths of Ionizing Particles through a Gas, 

 C. T. R Wilson, 470. — Dynamical Nature of the Molecular Sj 

 which emit Spectra of the Banded Type, E. T. Whittaker, 472. 



Geolotji/ and Natural History — Recent Contributions on Cycadophytans, G. 

 P. Wieland, 473. — Botanical Expedition to Newfoundland and Southern 

 Labrador, M. L. Fernald, 476. — Topographic and Geologic Survey of 

 Pennsylvania, R. R. Hice : Virginia Geological Survey Bulletin No. VI 

 477. — Hexahydrite, a New Mineral, A. A. Johnston, 478. 



llaneous Scientific Intelligence — A Study of Chiriquian Antiquities, G. 

 (>. jUacGurdy, 47S. — National Academy of Sciences, 479. — American 

 Association for the Advancement of Science, 480. 



Obituary — L. J. Troost : A. Michel-Levy : H. Risley : F. Ameghino, 480. 

 Index to Volume XXXII. 481. 



figfe 



