39) 
Rocxs— 
Dike at DeWitt, N. Y., Darton and 
Kemp, ix, 456. 
Elzolite-syenite from Hamburg, N. 
J., Kemp, v, 298; Litchfield, Me., 
etc., Bayley, iv, 500. 
Eruptive rocks, Yellowstone Nat. 
Park, Iddings, iv, 429; Chris- 
tiania, Brogger, 1, 348. | 
Gabbros in the Adirondack region, 
Smyth, viii, 54; of Minnesota, 
augite and plagioclase inter- 
growths in, Bayley, iii, 515. 
eae of the Laurentian, Adams, 
Granite, Conanicut Island, R. I., vi, 
0/2; Durbach, Sauer, iv, 429; 
mitiing in, Tarr, i, 267. 
a Argentine, Romberg, v, 
Greenstone schist 
Williams, ii, 259. 
Igneous rocks, of Arkansas, Wil- 
liams, iii, 159; of Eastern N. A., 
Williams, vii, 140; of Mexico, 
Cross, v, 119; of South Mt., 
Penn., Williams, iv, 482; of 
Tewan Mts., Iddings, i, 248; ori- 
gin of, Iddings, iv, 257. 
Lavas of Mt. Ingalls, California, 
Turner, iv, 455. 
Limestone, flexibility, Winslow, iii, 
133. 
Marble, thermal conductivity, 1, 
435. 
Mica-peridotite, Kentucky, iv, 286. 
Micro-pegmatite, Conanicut Island, 
7h. Ey vi, 374. 
Minette, Conanicut Island, R. L, 
vi, 8374; Montana, 1, 318. 
Nepheline rocks in Brazil, Derby, 
v, 74. 
Ottrelite in a metamorphic conglom- 
erate in the Green Mts., Whittle, 
iv, 270. 
Peridotite in Central New York, 
Smyth, iii, 322; dikes near Ithaca, 
N. Y., Kemp, ii, 410. 
Phonolite, Great Britain, v, 441. 
Phonolites, etc., of Montana, Pirs- 
son, 1, 394; Weed, 1, 506. 
Phonolitic rocks, Black Hills, vii, 
341. 
Phyllite, Conanicut Island, R. IL, 
vi, 376. 
Pyroxenic rock, azure-blue, New 
Mexico, Packard and Merrill, iii, 
279. 
Quartz-diorite porphyrite, 1, 311. 
in Michigan, 
VOLUMES XLI-L. 
553 
Rocxs— 
Roches Volcaniques, les Enclaves, 
Lacroix, vii, 404. 
Shonkinite, Montana, 1, 473. 
Sodalite-syenite and other rocks 
from Montana, Lindgren and 
Melville, v, 286; vi, 76. 
Spherulites in rhyolite, Iddings and 
Penfield, ii, 39. 
Syenite, Montana, 1, 470; Sagan- 
aga, Winchell, i, 386; same, 
Selwyn, iii, 319. 
Volcanic, see Igneous above. 
Yogoite, Montana, 1, 473. 
Rogers, F. J., magnesium as source 
of light, iii, 301. 
Rood, O. N., color system, iv, 263; 
photometric method which is in- 
dependent of color, vi, 173. 
Rosenbusch, H. von, Mikroskopische 
Physiographie, etc., 3d ed., v, 75. 
Rotation air pump, Berge, vi, 479. 
measurement of, Prytz, ii, 341. 
Roth, J., Geologie, i, 249. 
Rothpletz, calcareous alge, iii, 337 ; 
Querschnitt, Ost-Alpen, vii, 482. 
Rothwell, R. P., Mineral Industry in 
Be S., 4, 42%: 
Rowland, H. A., recent progress in 
spectrum analysis, i, 243. 
Royal Society of London, Catalogue 
of scientific papers, 1874-1883, iv, 
170. 
Ruedemann, R., graptolitic 
Diplograptus, ix, 453. 
Ruhmkorff coil, discharge, Moll, iv, 
genus 
Russell, I. C., are there glacial rec- 
ords in the Newark system ? i, 499 ; 
expedition to Mt. St. Elias, 1890, ii, 
171; Mt. St. Elias and its glaciers, 
iii, 169; Lakes of North America, 1, 
506. 
Russia, Mineralogy of, Kokscharow, 
v, 525. 
Nikitin on the Quaternary depos- 
its of, Wright, v, 459. 
Russie, Bibliothéque Géologique, de 
la, Nikitin, viii, 72. 
Ss 
Sabatier, Nitro-metals, vii, 478. 
Sabine, W. C., Laboratory Course in 
Physical Measurements, Vi, 74, 
Salisbury, R. D., Pleistocene and 
Pre-pleistocene of Mississippi basin 
i, 359; age of the orange sands, 
ii, 252 ; surface formations of south- 
Quartz-syenite porphyry, 1, 311. 
Rifting in granite, Tarr, i, 267. 
ern New Jersey, ix, 157. 
Sandersens, Nitro-metals, vii, 478. 
