49] 



VOLUMES XXI-XXX. 



485 



Thorium, radio-activity, Ashman, 

 27, 65; Dadourian, 21, 427. 



— compounds, radio-activity, Mc- 

 Coy and Ross, 21, 433. 



— and helium, 25, 146. 



— minerals and salts, radio-ac- 

 tivity, Boltwood, 21, 415. 



— new intermediate compound, 

 Hahn, 24, 79. 



— products, rays from, Hahn, 24, 



374- 



— salts, radio-activity, Boltwood, 



24, 93- 



Thornton, W. M., Jr., enargite, 

 covellite and pyrite, 29, 358. 



Thorp, F. H., Industrial Chemis- 

 try, 23, 460. 



Tillotson, E. W., Jr., orthoclase 

 twins, 26, 149; esters and esteri- 

 fication, 26, 243, 257, 264, 267, 

 .275. 



Time distribution in Paris, 25, 

 268. 



Todd, D., total solar eclipse, Jan., 

 1907, 21, 245. 



Topographic Maps, Salisbury and 

 Atwood, 27, 265. 



Tower, O. F., Qualitative Chemi- 

 cal Analysis, 27, 486. 



Trades and anti-trades, 23, 398. 



Transvaal, mines of, Moreau, 22, 

 89.. 



Travis, C, crystals in light paral- 

 lel to an optic axis, 29, 427. 



Trigonometry, Plane, Robbins, 

 29, 200. 



Trowbridge, C. C, interlocking of 

 feathers in flight of birds, 21, 

 145- 



Trowbridge, J., magnetic field and 

 coronal streamers, 21, 189; tele- 

 phone relay, 21, 339; phosphor- 

 escence produced by canal rays, 



25, 141; use of magnetic field 

 with X-ray tubes, 25, 143; Dop- 

 pler effect in positive rays, 27, 

 245; electric discharges through 

 hydrogen, 29, 341. 



Tschermak, G., silicate formulas, 

 22, 88. 



Tufts, F. L., photometric meas- 

 urements, 22, 531. 



Turtles, marine, Wieland, 27, loi. 



— Fossil, of No. America, Hay, 



26, 516. 



— from Upper Harrison beds, 

 Loomis, 28, 17. 



Tungsten, melting point of pure, 

 Wartenberg, 24, 440. 



Turkestan, Exploration, Pum- 

 pelly, 27, 413. 



Twenhofel, W. H., Silurian sec- 

 tion at Arisaig, Nova Scotia. 

 28, 143; peat beds of Anticosti 

 Island, 30, 65. 



Tyler, J. M., Man in the Light of 

 Evolution, 27, 419. 



U 



Uhler, H. S., deviation of rays by 

 prisms, 27, 223. 



Uinta Mts., glaciation, Atwood, 

 27, 340. 



Ultra-red radiation in gases, in- 

 fluence of pressure upon the 

 absorption of, Bahr, 30, 349. 



Ultra-violet rays, sterilization by, 

 Daguerre, 30, 414. 



Underbill, C. R., Wireless Teleg- 

 raphy, 27, 406. 



United States, see Geol. Reports, 

 Coast Survey, National Mu- 

 seum. 



— Dep't of Agriculture, 22, 550. 



— Economic Geology of, Ries, 

 21, 256. 



— magnetic tables, Bauer, 27, 

 263. 



Urals, northern, geology and 

 petrography, Duparc, 29, 272. 



Uranium, disintegration products, 

 Boltwood, 23, T^. 



— See also Radio-activity. 



Vacuum-tube, rectification effect, 

 Perkins, 25, 485. 



Valency, Theory of. Friend, 27, 

 337- 



Van Horn, F. R., proustite and 

 argentite, 25, 507. 



Van Name, R. G., Scientific papers 

 of J. Willard Gibbs. 23, 144; 

 velocities of reactions between 

 metals and dissolved halogens, 

 29, 237; cr3^stals of silver sul- 

 phate and dichromate, 29, 293. 



Veatch, A. C, localities of sup- 

 posed Jurassic fossils, 21, 457; 

 meaning of term Laramie, 24, 

 18; geology of Southwestern 

 Wyoming, 26, 239. 



Vehicles, self-propelled, Homans, 

 23, 399- 



