INDEX. 



4:89 



Gilpinite, Colorado, 477. 



Ivaite, Idaho, 118. 



Magnesite, etchings, 215; Mul 

 lanite, Montana, 66, 478. 



Rhodochrosite, etchings, 216. _• 



Siderite, etchings, 216; Smith 

 sonite, etchings, 217. 



Tin deposits, Virginia, 477. 



Tungstenite, Utah, 478. 

 Mines, Bureau of, Year Book, 1916, 



79; publications, 80, 476. 

 Missouri cherts, formation, Dean, 



411. 

 Murchison Medal, London Geol. 



Society, 478. 



N 

 Navajo Country, geology, Gregory, 



145- 

 Navigation, Jacoby, 74. 

 Nervous Impulse, Conduction of, 



Lucas and Adrian, 335. 

 Nervousness, Mastery of, Carroll, 



241. 

 Neurology, Herrick and Crosby, 



48S. 

 New Zealand, block mountains, 

 Cotton, 149. 



— Cretaceous faunas, Woods, 78. 



— geol. survey, 148, 423. 



— vegetation of Lord Howe Is., 

 Oliver, 148. 



Nickel Deposits, Miller and Knight, 



2 39- 

 Norwegian Arctic Expedition, geol. 



report, Holtedahl, 333. 

 Nova Scotia, Arisaig Silurian, Mc- 



Learn, 126. 



Patagonia, San-Jorge formation, 

 Windhausen, 1. 



Perry, H., Theories of Energy, 419- 



Philippine Journal of Science In- 

 dex, 424. 



Plant Pathology, Harshberger, 335. 



— Products, Chemistry, Haas and 

 Hill, 242. 



Plants, Anatomy of Woody, Jef- 

 frey, 152. 



Polarimetry, 418. 



Pressure, effect on crystals and 

 rocks, Bridgman, 243. 



Prime numbers, Thompson, 418. 



Projectile, motion of a spinning, 

 Prescott, 329. 



Pyrometry, Practical, 75. 



R 



Radiation, new secondary, of posi- 

 tive rays, Wolfke, 331. 



Rankin, G. A., the ternary system, 

 MgO-ALOs-SiOo, 301. 



Reagents and Reactions, Tognoli, 

 328. . 



Relativity and gravitation, Wool- 

 ward, 425. 



Robbins, W. W., Botany of Crop 

 Plants, 242. 



Rocks, eruptive, at Cuttingsville, 

 Vermont, Eggleston, 377. 



— Igneous, chemical analyses, 

 Washington, 238. 



Rogers, A. F., cristobalite in Cali- 

 fornia, 222. 



Russell, E. J., Soil Conditions, and 

 Plant Growth, 423. 



OBITUARY. 



Gilbert, G. K., 485. 

 Hinde, G. J., 485- 

 Hull, Edward, 80. 

 Lebour, G. A., 424. 

 Letts, E. A., 424. 



Observatory, Allegheny, 336; Cin- 

 cinnati, 336; Melbourne, 336. 



— Yerkes, publications, 472. 



Oceanography, Italian investiga- 

 tions, 335- 



Oil Geology, Ziegler, 423. 



Oldham, R. C, Structure of the 

 Himalayas, 76. 



Osborn, H. F., Origin and Evolu- 

 tion of Life, 77. 



Ozone, absorption bands, Fowler 

 and Strutt, 143. 



Savage, T. E., Early Silurian rocks 



of No. Michigan, 59. 

 Schuchert, C, Carboniferous of the 



Grand Canyon of Arizona, 347; 



Cambrian of the Grand Canyon 



of Arizona, 362. 

 Science, Introduction, Clark, 420. 



— Short History of, Sedgwick and 

 Tyler, 240. 



— Teaching, Twiss, 332. 

 Sedgwick, W. T., History of Sci- 

 ence, 240. 



Shannon, E. V., mullanite, 64; ilva- 



ite, Idaho, 118. 

 Sinclair, W. J., Parasuchian from 



the Triassic of Penn., 457. 

 Skeats, E. W., coral-reef problem 



and Funafuti borings, 81; and 



dolomite formation, 185. 



Am. Jour. Sci. — Fourth Series, Vol. XLV, ISTo. 270. 

 34 



-June, 1918. 



