INDEX. 



583 



Russia, black earth of ; roots and humus in 130, 363 



Rye grass, giant, of Northwest ; uses 470 



S. 



Saline and alkali lands, vegetation of 527 



plants, analyses of ashes of 530 



selective power of 531 



Saline and xerophile vegetation, similarity of 528 



Saline contents of waters, variations of 250 



solutions, structural and functional differences caused by 528 



vegetation, general character of 527 



Saltbushes, Australian, growth and use in California 469 



of Great Basin, probable usefulness 468 



Salt-grass ; range, tolerance of alkali, figure 546, 547 



Salton Basin, profile of salts in 438 



Salts, absorption of, by saline plants 529 



Saltwort : range, tolerance of alkali, figure 540, 542 



Samoa and Kamerun soils, analyses by Wohltmann ; method 402 



table of 404 



Samphire, Bushy and Dwarf ; range, alkali-tolerance, figure. . . .538, 539, 540 



Sand blasts, effects on cobbles 10 



coarse, effect of, on clays 105 



erosion of rocks by ; figure 10 



hammocks, of Gulf coast 56 



Sands of arid and humid regions, differences in. 86, 386 



table of analyses 387 



Sand, silt and dust 85 



Sandstones , 48 



argillaceous 57 



calcareous, formation of 56 



rich soils from 56 



dolomitic, often form poor soils 56 



ferruginous, poor soils from 56 



siliceous, poor soils from 55 



varieties of 55 



zeolitic, soils from 57 



Sandstone soils, lightness of 55 



soils, poor, of humid region 55 



Sand storms 9 



Sandy lands, of arid regions, highly productive 386 



Sandy soils 30 



Schone's elutriator, figure 90 



Shrinkage, extent of, in drying soils ; figure 113, 114 



Schubler on calcareous soils 115 



Sea water, average composition of, table 26 



chief ingredients useless to plants 28 



minor constituents of 27 



sources of salts in 26 



