488 



INDEX. 



Smith, E. G., Rock-forming minerals, 



156 ; pseudomorphs of limonite after 



pyrite, 376. 

 Soils, fixation of nitrogen in, 391. 

 Spectra, heat-, invisible, Langley, 1 ; 



photographic study of stellar, 407. 

 Spectroscopic optometer, 60. 

 Spectrum of cadmium, 426; solar, 319; 



ultra-red, 150; use of induction spark 



in studying, 218. 

 Spruce, It., Hepaticse Arnazonicag, 238. 

 Stammer, K., Chemical Problems, 221. 

 Stars, Uranometria Oxoniensis, 317. 

 Steel, structure of tempered. Bar us and 



Strouhal, 386 ; strain-effect of sudden 



cooling in, 439. 

 Stone, G. H.. wind action iD Maine, 133. 

 Sirouhal, V., structure of tempered steel, 



386 ; strain-effect of sudden cooling 



iu glass and steel, 439. 



Todd, J. E., Missouri Coteau, 69. 

 Trenton Natural History Society, Jour- 

 nal, 406. 



Van Hise, C. R., mica-schists and black 

 mica-slates of Penokee-Gogebic series, 

 453. 



Volcano, Barren Island, 394; eruption 

 of Kilauea, 397 ; explosive eruption, 

 Dana, 395; submarine in Atlantic. 22t> 



Vries, H. de. Plan ten- physiologie, 314. 



w 



Wachsmuth, C, and F. Springer, Pakeo- 

 crinoidea, 311. 



Wadsworth, M. E., Ore-deposits, 474. 



Ward, L. F., determination of fossil 

 dicotyledonous leaves, 370. 



Washburn Observatory, publications, 

 480. 



Wave, velocity of explosive, 149. 



Weiss, E , comets (Fabry) and (Bernard), 

 238. 



White, I. C, gas-wells on anticlinals, 393; 

 Pennsylvania Geology, 228. 



Whitfield, R. P., Fossil Scorpion, 228. 



Williams, A., Jr., Mineral Resources of 

 the United States, 229. 



Williams, G. H.. Pendotites near Peeks- 

 kill, N. Y., 26. 



Williams, S. G., Lower Helderberg in 

 New York, 139. 



Wind action in Maine, Stone, 133. 



Winkler, O, Gas- Analysis, 153. 



Wittrock, Erytkrasse Exsiccatas, 237. 



Woeikof, A., Croll's hypotheses of geo- 

 logical climates, 161. 



Wohler memorial, 320. 



Wood, T. F., Botanical work of M. A. 

 Curtis, 159. 



Zoology — 



Cicada, adaptation in, 316; Shark, 



living Cladodont, 73; Tissue, theory 



of origin of, Hyatt, 332. 

 See further under Geology. 



