INDEX. 



589 



PAGE 



White soils, nature of, in humid regions 285 



in arid regions 286 



Wind deposits 105 



Winds, action of, in forming soils 8 



cyclones, and anticyclones 293 



effects of, in deserts 8 



heat the cause of 291 



land and sea breeze 291 



trade, and monsoons 291 , 292 



Winter irrigation 236 



Wire-basket tests, of Bureau of Soils 337 



X. 



Xerophile vegetation, similarity to saline 529 



Y. 



Yazoo bottom, soils of . 1 16 



Yazoo ' buckshot " and Arroyo Grande soils 345 



Z. 



Zeolites, decomposition by acids 36, 38, 39 



exchange of bases in analcite and leucite 37 



formation of 37 



importance in soils 38 



rocks cemented by 38 



Zeolitic sandstones 57 



