39] 



VOLUMES XXXI-XL. 



543 



Spectrum invisible solar and lunar, Lang- 

 ley, vi, 397. 



of iron, vii, 495. 

 of magnesium, vii, 406. 

 maps of ultra violet, Pickering, ii, 

 223. 



nebula in Orion, Huggins, viii, 170; 

 xl, 173. 



of oxygen, Janssen. vi, 385 ; vii, 

 224. 



potassium, wave lengths of red-lines, 

 v, 413; vi, 467. 



of rare earths, Crookes, viii, 486. 

 of Sirius, xl. 175. 

 solar, i, 319. 



light, intensity in, v, 77. 

 oxygen lines in, vii, 75. 

 photographic map of, vii, 240. 

 photography of invisible por- 

 tions of, Zenger, viii, 411. 



relative wave-length in lines of, 

 Rowland, hi, 182. 

 ultra red, i, 150. 



unrecognized wave-lengths, Lang- 

 ley, ii, 83. 



of C Ursa Majoris, Pickering, ix, 46. 

 use of induction sparks in studying, 

 i, 218. 



See Spectra. 

 Spencer, J., Sound, Light and Heat, xl, 

 495 ; Magnetism and Klectricity, xl, 

 495. 

 Spencer, J. "W"., deformation of Iroquois 

 Beach and birth of Lake Ontario, xl, 

 443. 

 Sperry, E. S., composition of howlite, 

 iv, 220 ; mineralogical notes, vi, 317. 

 Sperry, F. L., pseudomorphs of garnet, 



ii, 307 ; triclinic feldspars, iv, 390. 

 Spherometer, well-, Mayer, ii, 61. 

 Spring, "W., criticism of Hallock on flow 

 of solids, v, 78 ; compression of pow- 

 dered solids, vi, 286. 

 Springer, F., Revision of Palasocrinoidea, 

 ii, 410; morphological relations of 

 summit-plates in Blastoids, Crinoids 

 and Cystids, iv, 232. 

 Spruce, R., HepatieEe Amazonicse, i, 238. 

 Squinabol, S., contribuzioni alia Flora 

 Fossile dei Terreni Terziarii della 

 Ligurio: I— II, ix, 72. 

 Stalagmometer and quantitative analysis, 



v, 248. 

 Stammer, K., Chemical Problems, i, 221. 

 Stars, fixed, parallaxes of, viii, 329. 



photographic determinations of posi- 

 tions, Gould, ii, 369. 



Uranometria Oxoniensis, i, 317. 

 See Spectrum. 

 Steam calorimeter, Wirtz, xl, 329. 

 electrified, vii, 316. 



Steam engine, output as a function of 

 speed and pressure, Nipher, viii, 281. ' 



Steel, behavior of under magnetic forces, 

 hi, 422 ; viscosity and temper of, Barus 

 and Strouhal, iii, 20, 308. 



effect of magnetization on viscosity 

 and rigidity of, Barns, iv, 175. 



effect of silicon on properties of, iii, 

 509. 



hydro-electric effect of temper, 

 Barus and Strouhal, ii, 276. 



strain-effect of sudden cooling, Barus 

 and Strouhal, i, 439 ; ii, 181. 



structure of tempered, Barus and 

 Strouhal, i, 386. 



viscosity and its relation to temper, 

 Barus and Strouhal, ii, 444. 



viscosity and relation to tempera- 

 ture, Barus, iv, 1. 



Steen, A. S., Beobachtungs-Ergebnisse 

 der norwegischen Polarstation Bos- 

 sekop in Alten, v, 345. 



Steinmann, G., Elemente der Palaontol- 

 ogie, vii, 235; ix, 420. 



Stellar, see Star and Spectrum. 



Stenzel, G., genus Tubicaulis of Cotta, 

 viii, 164. 



Stevens, W. L., apparatus for demon- 

 stration of reflection and refraction, v, 

 332; sensitive flame as a means of 

 research, vii, 257; microscope magni- 

 fication, xl, 50. 



Stevenson, J. J., faults in southwest 

 Virginia, iii, 202; Lower Carbonifer- 

 ous groups of Appalachian area in 

 Penn. and the Virginias, iv. 37. 



Stewart, B., Elementary Practical Phys- 

 ics, vol. ii, v, 79; Practical Physics, 

 v, 336. 



Stoddard, J. T., improved wave appara- 

 tus, ix, 218. 



Stokes, G. G., Beneficial Effects of Light, 

 iv, 401. 



Stone, G. H., wind action in Maine, i, 

 133; terminal moraines in Maine, iii, 

 378 ; glacial sediments of Maine, xl, 

 122. 



Stone implement, New Comerstown, O., 

 xl, 95. 



Stoney, G. J., cause of iridescence in 

 clouds, iv, 146. 



Storer, F. H , Agriculture, iii, 432, 509. 



Strains, energy m, Barus, vi, 468. 



Strouhal, V., structure of tempered steel, 

 i, 386; strain-effect of sudden cooling 

 in glass and steel, i, 439. 



strain-effect of sudden cooling in 

 glass and steel, ii, 181; hydro-electric 

 effect of temper in steel, ii, 276; vis- 

 cosity of steel and its relation to tem- 

 per, ii, 444. 



