566 INDEX. 



PACK 



Alkali lands, summary of conclusions 453 



surface and substrata of 4 2 9 



utilization and reclamation of 455 



of world-wide importance. ... o ... o 424 



vegetation of 534 



Alkali-resistant crops , 455 



Alkali salts, black and white 44 1 



composition of 439 



composition of ; general table 44 2 i 443 



distribution in heavy lands 43^. 437 



effects on beet crop 465 



horizontal distribution of 439 



in hill lands 439 



in sandy lands 433i 435 



in Salton Basin, distribution of 43^> 43^ 



leaching-down of 459 



nature of 4 2 3 



plant food in 44 J i 444 



reactions between 449> 45 



reduction by cropping 463 



relative injuriousness of 464 



removal from the soil 45$ 



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. 43 1 . 43^ 434 



Alkali soils and seashore lands 4 22 



calcareous character of 2 ^ 



composition of, as a whole 445. 44^, 447 



how native plants live in 43 



origin of 4 22 



repellent aspect, cause of 4 2 4 



retention of silica in 39 2 



Alkali spots, white 26 



Alkali, rise of 4 2 8 



turning under of surface 45 



weeds as cattle food 4 



study of, by Loughridge and Davy 535 



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



Alluvial soils I2 



Ammonia-forming bacteria J 49 



Ammonia gas, absorption of, by soils ; figure 2 74i 2 75 



Ammonic carbonate, effects on glass J 8 



Ancient civilizations, preference for arid countries 4 T 7 



rare in humid countries 4 J 8 



Apatite 6 3 



