PLATE VII 



A. Creosote bush and other vegetation in the desert, illustrating 

 the habit of wide spacing between plants owing to the scarcity 

 of moisture in the soil. 



B. Eucalyptus grove on eroded bank, illustrating depth of rain- 

 fall penetration at about 7 feet as indicated by dark shadowy 

 line below the light colored gravel strata. Note tree roots 

 extending through the gravel into finer soil. 



