45] 



VOLUMES XXI-XXX. 



481 



ROCKS. 



Lava-riovv, artificial, Pirsson, 

 30, 97, 427. 



Lujavrite, new, Lapland. 29, 367. 



Metamorphic rocks of St. Fran- 

 cis Valley, Quebec, Dresser, 

 21, 67. 



Minette, apatitic, Ransome, 26, 

 337- 



Mount Yamaska, Quebec, pe- 

 trography. Young, 23, 69. 



Pegmatite, Massachusetts, 

 Warren, 28, 449. 



Peridotites of N. Carolina, Pratt 

 and Lewis, 21, 253. 



Petrography of Erythrea, East 

 Africa, Manasse, 29, 87; of 

 northwest Greenland, Below- 

 sky, 21, 184; of Red Hill, 

 N. H., Pirsson and Washing- 

 ton, 23, 257, 433; of the Urals, 

 Duparc, 29, 272. 



Phenocrysts in igneous rocks, 

 Miers, 21, 182. 



Plutonic rocks, classification, 

 Hatch, 27, 411. 



Pre-Cambrian rocks, George- 

 town, Colorado, Ball, 21, 371. 



Rocks from the Olympic Mts., 

 Washington, Arnold, 28, 9. 



— of Tahiti, Lacroix, 30, 360. 

 Scapolite rocks of America, 



Spurr, 25, 154. 



Schistosity by crystallization, 

 Wright, 22, 224. 



Schists, crystalline, Gruben- 

 mann, 23, 150. 



Silicate and carbonate rocks, 

 analysis, Hillebrand, 30, 84, 

 88. 



Spessartite, Belknap Mts., 

 N. H., Pirsson and Washing- 

 ton, 22, 453. 



Spherulitic crystallization, Pirs- 

 son, 30, 97, 427. 



Syenite, Belknap Mts., N. H., 

 Pirsson and Washington, 22, 

 439- 



— of Plauenscher Grund, Wash- 

 ington, 22, 129. 



Unakite, Virginia, Watson, 22, 



248. 

 Volcanic rocks, central Italy, 



Washington, 23, 68; of No. 



Carolina, J. E. Pogue, Jr., 28, 



218; of Queensland, Jensen, 



23. 70. 

 Volcanoes, Catalan, and their 



rocks, Washington, 24, 217; 



ROCKS. 



Calderon, Cazurro and Fer- 

 nandez-Navarro, 24, 282. 

 Weathering of rocks, Hilgard, 



21, 261; Alerrill, 23, 149. 

 Yamaskite, Young, 23, 70; re- 

 lated rock, from the Monte- 

 regian Hills, Canada, 28, 71. 

 Rogers, A. F., pyrite crystals 

 from Utah, 27, 467; anhydrite, 

 etc., from Kansas, 29, 258. 

 Rohwer, S. A., fossil insects from 



Colorado, 28, 533. 

 Rolfe, G. W., Polariscope, 21, 174. 

 Roman comagmatic region, Wash- 

 ington, 23, 68. 

 Rontgen radiators, secondary, 



Barkla, Crowther, 24, 499. 

 — ■ rays, absorption, Seitz, 26, 577. 

 diffraction, Walter and Pohl, 



25, 451- 



energy of. Carter, 23, 143. 



heating effects in metals, 



Bumstead, 21, i; 25, 299. 



— — in instantaneous photog- 

 raphy, Dessauer, 29, 82. 



ionization by, Herweg, 21, 



327. 

 polarization, Herweg, 28, 76. 



— — production of corpuscular 

 rays by, Cooksey, 24, 285. 



refraction, Walter and Pohl, 



28, 76. 



— — spectrum and absorption, 

 Adams, 23, 9. 



— — • transmission, Adams, 23, 

 375- 



— — tubes for use in magnetic 

 field, Trowbridge, 25, 143. 



— ■ — velocity, Marx, 22, 461; 27, 

 187. 



wave-length. Van der Waals, 



23, 384- 



Rosenbusch, H., Festschrift, 22, 

 545; Physiographic der massi- 

 gen Gesteine, 23, 394; 26, 583. 



Ross, W. H., radio-activity of tho- 

 rium compounds, 21, 433. 



Royal Society, London, publica- 

 tions, 22, 192. 



Ruedemann, R., graptolites of 

 New York, 26, 402; Paleozoic 

 platform of North America, 30, 

 403- 



Rurer, R., Elements of Metallo- 

 graphy, 28, 554. 



Russell, I. C, obituary notice of, 

 21, 481. 



