566 INDEX. 



PACK 



Alkali lands, summary of conclusions 453 



surface and substrata of 429 



utilization and reclamation of 455 



of world-wide importance. ....... c 424 



vegetation of 534 



Alkali-resistant crops 455 



Alkali salts, black and white 441 



composition of 439 



composition of ; general table 442, 443 



distribution in heavy lands 436, 437 



effects on beet crop 465 



horizontal distribution of 439 



in hill lands 439 



in sandy lands 433, 435 



in Salton Basin, distribution of 436, 438 



leaching-down of 459 



nature of 423 



plant food in 441, 444 



reactions between 449, 450 



reduction by cropping 463 



relative injuriousness of 464 



removal from the soil 458 



removal by deep-furrow irrigation ; figure 460, 461 



tolerance of various crop plants ; table 466, 467 



total in lands ; estimation of 444 



underdrainage the universal remedy for 460 



upward translocation from irrigation 433 



vertical distribution in soils 429, 431, 432, 434 



Alkali soils and seashore lands 422 



calcareous character of 28 



composition of, as a whole 445, 446, 447 



how native plants live in 430 



origin of 4 22 



repellent aspect, cause of 424 



retention of silica in 392 



Alkali spots, white 286 



Alkali, rise of 428 



turning under of surface 456 



weeds as cattle food 468 



study of, by Loughridge and Davy 535 



Aluminic hydrate, in soils of California and Mississippi ; table 101, 390 



Alluvial soils 12 



Ammonia-forming bacteria 149 



Ammonia gas, absorption of, by soils ; figure 274, 275 



Ammonic carbonate, effects on glass 18 



Ancient civilizations, preference for arid countries 417 



rare in humid countries 418 



Apatite 63 



