29] 



VOLUMES XXI-XXX. 



4G5 



Igneous injection and mountain 

 building, Daly, 22, 195. 



— intrusion, mechanics of, Daly, 



26, 17. 



— Rocks, Harker,28,S03; Iddmgs, 

 28, 502. 



— See ROCKS. 



Ihering, H. von, Archhelenis and 



Archinotis, 26, 513. 

 Illinois Geol. Survey, see GEO- 



LOG. REPORTS. 



— lower Paleozoic stratigraphy, 

 Savage, 25, 431. 



— Ordovician and Silurian for- 

 mations, Savage, 28, 509. 



— University, bulletins, 23, 399; 

 30, 292. 



Immuno-Chemistry, Arrhenius, 



25, 81. 

 India, Board of Scientific Advice, 



report, 24, 508. 



— commercial products. Watt, 



27, 417- 



— geology, Vredenburg, 25, 264. 



— geological survey, 24, 181. 



— Mineral Resources, Holland, 



28, 196. 



— Permian in, Koken, 26, 165. 

 Indiana Geol. Survey, see GEO- 

 LOGICAL REPORTS. 



Indians, Handbook of American, 



Hodge, 24, 91. 

 Influence Machines, Schaffers, 28, 



79- 

 Ingersoll, E., Life of Animals, 22, 



191. 

 Insects, Work on Fossil, Hand- 



lirsch, 21, 468; 22, 349; 23, 311; 



24, 447; 25, 264; 26, 584; 27, 263. 



— Permian. Sellards, 22, 249; 23, 

 345; 27, 151. 



— Tertiary, Cockerell, 23, 285; 25, 

 SI, ,227, 309; 26, 69; 27, 53, 381; 

 28, 283; Rohwer, 28, 533; Wick- 

 ham, 26, 76; 28, 126; 29, 47. 



— See Zoology. 

 Interference figures under the 



microscope, Wright, 22, 19; 26, 

 536. 



— phenomena, Hauswaldt, 27, 490. 

 Interferometry, use of grating in, 



Barus, 30, 161. 



Intrusion, igneous, mechanics of, 

 Daly, 22, 195; 26, 17. 



Invertebrates, Guide to, Boston 

 Society Natural History, Shel- 

 don, 21. 336, 475. 



— See GEOLOGY. 

 Ion, new Journal, 27, 98. 



Ionium, new radio-active element, 

 Boltwood, 24, 370; 25, 289, 365; 

 Marckwald and Keetmann, 25, 

 347- 



Ionization of air, efifect of dust 

 and smoke on. Eve, 29, 552; 

 periodicity of. Wood and Camp- 

 bell, 23, 224. 



— and electric convection, Ama- 

 duzzi, 23, 463. 



— of gases, Rausch, 27, 187. 



— of the ocean atmosphere. Eve, 

 23, 224. 



— produced by alpha rays, 

 Wheelock, 30, 233. 



Ionized Air, effect of magnetic 



field, Blanc, 25, 348. 

 Ions, decay in the fog chamber, 



Barus, 23, 460; in dust-free air, 



Barus, 22, 136. 



— Electrons and Corpuscules, 

 Abraham and Langevin, 21, 466. 



— in air, recombination of, 

 Bragg and Kleeman, 21, 399. 



Iowa, Devonian fishes, Eastman, 

 27, 415. 



— geol. survey, see GEOLOGI- 

 CAL REPORTS. 



Iron, cementation by charcoal, 

 Guillet and Griffiths, 28, 409. 



— Chem. Analysis, Blair, 26, 511. 



— shale from Canyon Diablo me- 

 teorite, Farrington, 22, 303. 



— See Meteorite. 



Islay, geology, Wilkinson, Teall 



and Peach, 24, 503. 

 Isostasy, Hayford on, 22, 185; 29, 



193; 30, 290. 



Jackson, C. L., obituary notice of 

 Wolcott Gibbs, 27, 253. 



Jahrbuch fiir Mineralogie, etc., 24, 

 92. 



Japan, chalcopyrite crystals. Ford, 

 23, 59- 



— Imperial Agricultural Station, 

 22, 94. 



Japanese Earthquake Investiga- 

 tion Committee, 23, 322; 24, 90; 

 26, 240. 



Jenney, W. P., great Nevada 

 meteor of 1894, 28, 431. 



Johannsen, A.. Key for Rock- 

 forming Minerals, 25, 599; 

 Rock-forming Minerals, 27, 490; 

 petrographic microscope im- 

 provements, 29, 435. 



