506 



INDEX. 



Chemistry— 



Silver and alkali-metals, double halides 

 of, Wells and Wheeler, 155. 

 chlorides, Lea, 444, 446. 

 hemisulphate, Lea, 322. 

 notes on, Lea. 444. 

 oxide, estimation and dehydration 

 of, Lea, 249 

 Strontium separated from calcium, 

 Browning, 462. 

 Clarke, F. W., constitution of ptilolite 



and mordenite, 101. 

 Clarke, J. M., list of species of the 



Oriskany fauna N. Y., 411. 

 Claypole, Palseaspis of. 428. 

 Color of compounds and their chemical 

 constitution, Schutze, 252 



of solutions of salts as affected by 

 the concentration of the ions, Line- 

 barger, 416. 



photography, Lippmann, 75, 499; 

 Vogel, 423. 



system, Rood, 263. 

 Conwentz, von H , Untersuchungen liber 



fossile Holzer Schwedens, 260. 

 Crehore, A. C, effects of self-induction 

 and distributed static capacity in a 

 conductor, 389. 

 Cross, W., post-Laramie deposits of 

 Colorado, 19 ; new occurrence of ptilo- 

 . lite, 96. 



D 



Dana, J. D., Jura-trias trap of New 

 Haven region, 165. 



Danner, E. W., interaction of potassium 

 permanganate and sulphuric acid, 301. 



Darton, N. H., fossils in the Archaean 

 rocks of Central Virginia, 50. 



Daubree, Work on Experimental Geol- 

 ogy, 499. 



Day, D. T., Mineral Resources of the TJ. 

 S., 430. 



Delgado, J. F. N., chiastolite from Por- 

 tugal, 79. 



Dewey, F. P.. catalogue of collections in 

 Economic Geology in the U. S. Mu- 

 seum, 259. 



Diller, J. S., mica-peridotite from Ken- 

 tucky, 286 ; geology of the Taylor- 

 ville region, California, 330. 



Dumble, E. T., Geol. survey of Texas, 

 427. 



E 



Eakms, L. G., new occurrence of ptilo- 

 lite, 96. 



Earthquake, the great Japan, 1891, 

 Milne and Burton. 80. 



Electrical conductivity of rock magmas, 

 Barus and Iddings, 242. 



discharge, action on gases and va- 

 pors, Ludeking, 254. 

 oscillations, Toepler, 423; Zehnder, 

 498. 



resistance of allotropic silver, Over- 

 beck, 4 24; of the human body, 

 von Frey, 76 ; of metals, Dewar 

 and Fleming, 499. 

 waves, absorption power of metals 

 for the energy of, 498. 

 Electricity of waterfalls, Lenard, 423. 

 Electrification and cloud condensation, 



Aitken, 254. 

 Electromagnetic and electrostatic units, 



ratio between, Abraham, 254. 

 Electrometer, capillary, Whitmore, 64. 



Ferry, E. S., persistence of vision, 192. 

 Fossil, see Geology. 



G 



Gannett, H., dictionary of altitudes in 



the United States, 262 

 Geikie, A., history of volcanic action in 



the British Isles. 76. 

 Genth, F. A., penfieldite, a new species, 



260 ; contributions to mineralogy, No. 



54, 381. 

 Geological society of America, 81 ; 



Rochester meeting, 333, 

 Geological Reports and Surveys — 



Alabama, 1892, Smith, 78, 427. 



Arkansas, 1890, Branner, 332; Pen- 

 rose, 428. 



Iowa, 500. 



Kentucky, 1890, 1891, Procter, 78. 



New Jersey, 1891, Smock, 77. 



New York, Palaeontology, vol. viii, 

 Hall, 330. 



Texas, Dumble, 427. 

 Geology — 



Archaean of Central Virginia, fossils 

 from, Darton, 50. 



Artesiau boring in Texas, Hill, 406. 



Artesian and underground waters in 

 Texas, etc., Hill, 333. 



Brachiopoda, development, Pt. ii, 

 Beecher, 133. 



Cambrian rocks of Pennsylvania and 

 Maryland, Walcott, 469; of Vir- 

 ginia, etc,, Walcott, 52. 



Chiastolite in fossiliferous slates of 

 Portugal, Delgado, 79. 



Claosaurus and Ceratosaurus, restora- 

 tions, Marsh, 343. 



Coral Islands off New Guinea, up- 

 raised, Macgregor, 256. 



