INDEX 



531 



PAGE 



Windbreaks, disadvantages of . . .213 



Effectiveness of 213 



To prevent erosion 496 



Wind, control of erosion by 496 



Deposits, composition of 63 



Effect of cloth tent on 215 



Effect on evaporation 213 



Effect on percolation 168 



Effect upon movement of soil 



air 443 



Formed soils, deposition of 60 



Formed soils, relation to loess . . 60 



PAGE 



Wollny, best soil moisture content .156 

 Conclusions concerning soil tem- 

 perature 462 



On temperature of soil 459 



Water used by plants 134 



Wood ashes 342 



Worms, effect on the soil 389 



Zeolites, effect on absorption by 

 the soil 299 



