510 



GENERAL INDEX. 



[32 



Phosphates of the Western United 

 States, Mansfield, 46, 591. 



Phosphorus, geologic role, Black- 

 welder, 42, 285. 



Photographic phenomenon, 49, 146. 



Physical Science, Laws of, North- 

 rup, 44, 79. 



— Tables, Smithsonian, Fowle, 50, 

 466. 



Physics, a century's progress, Page, 



46, 303- 



— Experiments in, Franklin and 

 MacNutt, 46, 618. 



— General, Crew, 42, 501; Frank- 

 lin and MacNutt, 43, 168. 



— Measurements, Ferry, 47, 138. 



— Molecular, Crowther, 48, 473. 



— Practical, Millikan and Gale, 



50, 394- 



— Problems in, Henderson, 42, 

 500; Masius, 44, 404. 



— Technical, Anderson, 47, 229; 

 Arnold, 42, 437. 



— Textbook, Duff, 42, 436. 

 Physiology, Chemical, Cramer, 46, 



549; Elementary, Huxley, 41, 



I5i. 

 Phytopathology, Whetzel, 46, 549. 

 Pidduck, F. B., Electricity, 42, 79- 

 Piedmont terraces of Appalachians, 



Barrell, 49, 227, 327, 407. 

 Pierce, G. W., Electric Oscillations 



and Electric Waves, 49., 303. 

 Pigeon Point, Minnesota, Geology, 



Daly, 43, 422. 

 Pillsbury, W. B., Psychology, 43, 



254- 

 Pirsson, L. V., rise of Petrology 

 as a science, 46, 222. 



— Physical Geology, 50, 469. 



— obituary notice, W. Cross, 50, 



173. 

 Planetary System, Origin, Miller, 



46, 542. 

 Plants, see BOTANY. 



— Australian flowering, geological 

 history, Andrews, 42, 171; 43, 



1/4, 339- 



— fossil, Berry, 45, 78; Knowlton, 

 49, 189; Seward, 46, 475; 49, 223. 



— Mesozoic and Cenozoic of No. 

 America, Knowlton, 49, 307. 



— and animals, evolution, Berry, 

 49, 207. 



Plaster of Paris, Troxell, 41, 199. 



Platinum, in 1919, 50, 471; in peri- 

 dotite, Urals and Spain, Duparc, 

 43, 173; Russian, 49, 451. 



Pleistocene deposits, relative ages, 

 Hay, 47, 361; Mt. Desert Is., 42, 

 3991 see GEOLOGY. 

 Pogue, J. E., emerald deposits of 



Muzo, Colombia, 42, 85. 

 Poiseuille's law for compound 



tubes, Schleier, 49, 447. 

 Poisson's Equation, failure of, 

 j Prasad, 44, 333- 

 Polarimetry, 45, 418. 

 j Polarization surface, Jentzsch- 



Grafe, 48, 472. 

 : Porter, J. G», All-American Time, 



47, 310. 



Porter, L. E., detection and separa- 

 tion of tellurium, arsenic, etc., 42, 

 106; separation of gallium, 44, 

 221. 



Porto Rico, 1918 Earthquake, 50, 

 236; Scientific Survey, 50, 237. 



— Tertiary formations of, Maury, 



48, 209. 



Posnjak, E., hydrated ferric oxides, 



47, 3ii. 

 Potash, extraction from silicate 

 rocks, Ross, 43, 485. 



- See CHEMISTRY. 

 Potential measurements, switch 



for, White, 46, 610. 



Pottsville formations and faunas, 

 Mather, 43, 133. 



Powers, S., explosive ejectamenta 

 of Kilauea, 41, 227; volcanic 

 domes in the Pacific, 42, 261; 

 granite in Kansas, 44, 146; But- 

 ler salt dome, Texas, 4Q, 127; 

 Hawaiian petrology, 50, 256. 



Pratt, H. S., Zoology, 41, 150. 



Pre-Cambrian era, Lawton's cor- 

 relation, Lane, 43, 42; see GE- 

 OLOGY. 



Precious Stones in 1917, Kunz, 47, 

 238; in 1919, 50, 471- 



— in 1914, Sterrett, 41, 223. 

 Precipitation, rhythmic, and diffu- 

 sion, Stansfield, 43, 1. 



Pressure, effect on crystals and 

 rocks, Bridgman, 45, 243. 



— external, growth of crystals 

 under, Taber, 41, 532. 



Pribilof Islands, geological notes 



on, Hanna, 48, 216. 

 Prickly Pear, Australia, Alexander, 



48, 475- 

 Priestley memorial, 44, 332. 

 Prime numbers, Thompson, 45, 418. 

 Projectile, motion of a spinning, 



Prescott, 45, 329. 

 Prosser, C. S., stratigraphic posi- 



