INDEX. 



A. 



PACK 



Absorption and movements of water in soils 221 



of solids from solutions 267 



of gases by soils 272, 275 



Acacias, tolerance of alkali 480 



Accessory minerals 5 



Acid, strength used in soil analysis 34 1 



Acidic and basic eruptive and metamorphic rocks 49 



Acidity, neutrality, alkalinity of soils 322 



Acids of different strengths, analysis with ; table 326, 341 



Action of plants in soil formation, mechanical and chemical 19 



Aeration and reduction as influencing nitrification 14? 



effects of insufficient, in soils 280 



excessive, injury in arid regions 280 



^Erobic and anerobic bacteria M4 



Air, functions in soils 279 



" of soils, composition of 280 



Air-space in soils ; figure 108 



Alabama, vegetation and soil-characters 5 11 



Alaska current, effects on California climate 296 



Alinit 149 



Alkali carbonates and sulfates, inverse ratio 45 1 . 45 2 



carbonates, effects on clay 62 



effects on culture plants ; figure 426, 4 2 7 



Alkali-heath, range, tolerance of alkali, figure 544, 545 



Alkali lands, crops for strong 468 



effects of irrigation on 428 



efficacy of shading 457 



exceptionally productive when reclaimed 483 



fertilization not needed in 483 



formation from leachings of slopes 453 



geographical distribution of 4 2 3 



high and lasting production when reclaimed 482 



inducements toward reclamation of 481 



in the San Joaquin valley, Cal., figure 4 2 5 



possible injury to, from excessive leaching 462 



565 



