m~ Index XI-XX, now ready. Price $1.00. 



CONTENTS. 



Page 



Art. XXIX. — A Telephone Relay ; by J. Trowbridge . .. 339 



XXX. — Stony Meteorite from Coon Butte, Arizona ; by J. 



W. Mallet . 347 



XXXI. — New Stony Meteorite from Modoc, Scott County, 



Kansas; by G. P. Merrill, with analyses by W. T assist 356 



XXXII. — Determination of the Feldspars by Means of their 



Refractive Indices ; by F. E. Wright 361 



XXXIII.— Siderite and Barite from Maryland ; by W. T. 



SCHALLER . 364 



XXXIV. — Pre-Cambrian Rocks of the Georgetown Quad- 

 rangle, Colorado; by S. H. Ball 371 



XXXV. — Lower Paleozoic Formations in New Mexico ; by 



C. II. Gordon* and L. C. Gratox _ 390 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Carbon Suboxide, Diels and Wolf : New Method 

 for the Quantitative Determination of Halogens in Organic Compounds, 

 Vattbel and Scheuer, 396 — Distillation of Metals of the Iron Group, 

 Moissan : Atomic Weight of Eadium, H. C. Jones, 397. — Mechanical 

 Separation of Organic Substances, Bordas and Touplain : Constitution 

 of the Electron, W. Kaufmann, 398. — Retardation of the Velocity of the 

 a Particles in passing through Matter, Rutherford : Electrical Conduc- 

 tivity of Flames containing Salt Vapors for alternating currents, Wilson 

 and Gold : Electrically prepared Colloidal Solutions, Burton : Recom- 

 bination of Ions in Air and other Gases, Bragg and Kleeman, 399. — 

 Nucleation of the Atmosphere, 400. 



Geology and Mineralogy — Geology, Chamberlin and Salisbury, 400. — Traite 

 de Geologie, A. de Lapparent, 401. — Coon Butte, Arizona, and the Can- 

 yon Diablo Meteorites, Barringer and Tilghman, 402. — Geology of the 

 New Hebrides, Mawson, 403. — Salient Geological Features of British New 

 Guinea, Maitland : Geological Survey of Canada, 404. — Mica : its Occur- 

 rence, Exploitation and Uses, F. Cirkel : Beitrage zur Mineralogie von 

 Japan : Studies in Fluorite, H. W. Morse, 405. — International Geological 

 Congress, 406. 



Miscellaneous Scientific Intelligence — National Academy of Sciences : Frank- 

 lin Bi-Centenary, 406. — Chemistry of the Proteids, G. Mann : Wilhelm 

 Fliess und Seine Nachentdecker, O. Weininger und H. Swoboda, R. 

 Pfennig: Lagoon of Venice, 407. — The Philippine Journal of Science: 

 Field Columbian Museum, 408. 



Obituary — James Mills Peirce, Nathaniel S. Shaler, M. P. Curie, Lionel 

 Smith Be ale. 



