INDEX. 



551 



Obituary — 



Lovering, J., 167. 



Mosely, H. N., 80. 



Ramsay, Sir A. C, 168. 



Rust, W. P., 167. 



von Rcemer, F., 168. 



Watson, S., 338, 441. 

 Optical angle, estimation. Lane, 79. 

 Ostwald's Klassiker der exacten Wissen- 



schaften, Nos. 25-30, 166. 

 Ostwald, W., solutions, 335. 

 Owens, W. G-., meteorite from Pennsyl- 

 vania, 423. 



Packard, R. L., azure-blue pyroxenic 

 rock, New Mexico, 279. 



Pendulum, free, as time standard, Men- 

 denhall, 85. 



Penfield, S. L., crystallography of cae- 

 sium trihalides, 1 7 ; crystallographic 

 notes, 184; crystallography of ru- 

 bidium and potassium trihalides, 475. 



Peru, astronomical expeditions, 240. 



Peters, E. D., Jr., American methods of 

 copper smelting. 167. 



Phasemeter. Trowbridge, 232. 



Phosphate nodules of South Carolina, 

 Reese, 402. 



Phosphates of America, Wyatt, 79. 



Photography, orthochromatie, Fabre 

 and Andoyer, 239. 



Physics, prize for researches in, 240. 



Physiography, Spencer, 542. 



Powell, J. W.. U. S. Geol. Survey re- 

 port, 1888-89, 155. 



Prantl, K., Die naturlichen Pflanzen- 

 familien, Nos. 68, 69, 162. 



Preston, E. D., latitude observations on 

 Oahu. Hawaiian Is., 438. 



Pumpelly, R., structural relations of the 

 Huronian, 224. 



Pupin, M. I., action of vacuum discharge 

 streamers, 263; electrical and coro- 

 noidal discharges, 463. 



R 



Radiation, absorption by alum, Hutch- 

 ins, 526. 



of atmospheric air, Hutchins, 357 ; 

 Abbe, 364. 



of gases, Pringsheim, 433. 

 Reese, C. L., phosphate nodules of South 



Carolina, 402. 

 Riggs, R. B., separation of iron, manga- 

 nese and calcium, 135. 

 Rocks — 



Alnoite, melilite-bearing rock from 



Canada, Adams, 269. 

 Augite and plagioclase, fibrous inter- 

 growth in Minnesota gabbro, Bay- 

 ley, 515. 



Rocks — 



Igneous, of Arkansas, Williams, 159. 



Limestone, flexibility, Winslow, 133. 



Peridotite in central New York, 

 Smyth, 322. 



Pyroxenic rock, azure-blue, New 

 Mexico, Packard and Merrill, 279. 



Syenite, Saganaga, Selwyn, 319. 

 Rogers, P. J., magnesium as source of 



light, 301. 

 Rothpletz, calcareous algse, 337. 

 Russell, I. C, Mt. St. Elias and its gla- 

 ciers, 169. 



s 



Saporta, Recherches sur la Vegetation 



du niveau Aquitanien, 338. 

 Schneider, E. A., constitution of certain 



micas and chlorites, 378. 

 Scott, A., Introduction to Chemical The- 

 ory, 152. 

 Scudder, S. H., Index to known fossil 



insects of the world, 244. 

 Selwyn, A. R. O, Saganaga syenite, 319. 

 Shaler, on Morasses, 155 ; on coral reef 



of east Florida, 155. 

 Smith, E. F., Experiments for students 



in General Chemistry, 153. 

 Smithsonian Institution, report for 1890, 



540. 

 Smyth, C. H., Jr., peridotite in central 



New York, 322 ; Clinton iron ore, 487. 

 Solms-Laubach, fructification of Ben- 



nettites Gibsonianus, 337. 

 Solomon Islands, chalk and flints, Liv- 



ersidge, 157. 

 Solution and pseudo-solution, 333. 

 Solutions, Ostwald, 335. 

 Sound, velocity, Melde, 239. 

 Stanton, T. W., stratigraphic position of 



Bear River formation, 98. 

 Sullivan, G. M., Kentucky geol. survey, 



80. 

 Surface tension in analysis, Gossart, 331. 



Tarr, R. S., Permian of Texas, 9; cen- 

 tral Massachusetts moraine, 141. 



Taylor, F. B., highest shore line on 

 Mackinac Island, 210. 



Telephone as an optical instrument, 

 Wien, 155. 



Temperature, method for obtaining con- 

 stant, Clew, 239. 



Temperatures, low, Pictet, 153. 



Terrestrial magnetism, Wilde's explica- 

 tion, Bauer, 496. 



Texas, Permian of, Tarr, 9. 



Tile-fish, 481. 



Thompson, J. O., law of elastic length- 

 ening, 32. 



