INDEX. 



PACK 



Drainage, rights-of-way for ......... . ................... ............. 461 



Drainage waters, use for irrigation ................................... 250 



Drain waters, analyses of, table ...................................... 22 



leaching effects of .......... ............................ 271 



Drouth, resistance to, in arid soils ............................ ....... 167 



Dust soils, nature of ............................................. 104 



slow penetration of water in .............................. 105 



Dust storms ........................................................ 9 



Dynamite, used for shattering dense substrata ...................... . 181 



Earth's crust, known thickness ..................................... xxix 



Earthworms, action of in soil-formation .............................. 158 



Ecological studies ................................................... 314 



Egypt, obelisks of ................................................... 2 



Elements constituting earth's crust, table of ................... ---- . xxix 



important to agriculture, list of ........... ................ xxxi 



Elutriator, Hilgard's, figure ......................................... 91 



Epsomite, epsom salt, in soil ...................................... 78 



Eremacausis ........................................................ 129 



Erosion in arid regions ............................................... 219 



in Mississippi table lands ; figures ............................ 218 



lowering of land by ........................................ 15 



of rocks by sand ; figure .................................... 10 



Eruptive rocks, basic and acidic ..................................... 49 



rocks, soils from ........................................... 52 



Eucalyptus, tolerance of alkali ..................................... 480 



European observations on plant distribution ........................ 519 



standards of plant-food adequacy Maercker's table .......... 369 



Europe, predominance of calcareous formations in ................... 525 



Evaporation and crop yields, calculated ........... ..................... 193 



and crop yields, observed (Fortier) ............. ......... 194 



and plant growth ........................................ 193 



counteracting, in alkali lands ........................... 455 



dependence on air temperature ; Fortier's experiments, 



table ...... ......................................... 255 



from reservoirs and ditches .............................. 257 



from water surfaces ............ .......................... 254 



wet and moist soils ................................. 254 



in different climates .................................. 192, 256 



in different localities, California ......................... 255 



restrained by loose surface layer ......................... 255 



through roots and leaves, amount of .................. 262, 263 



Expansion by oxidation .............................................. 18 



Farmyard or stable manure .......................................... 72 



Feldspars, weathering of ............................................. 31 



products of .................................... 32 



