CHAPTER XVI. 107 



mountains or on the plains. There is a promising field for develop- 

 ment in this latter line in Southern California. 



He must know the geology of the reserves. This is important on 

 account of the rainfall delivery from different geological formations, 

 and also because different soils often vary greatly in the amount and 

 kind of forest growth they will best support. 



Finally, some attention should be given to appropriate sites for 

 storage reservoirs^ with sufficient watersheds and rainfall to fill them. 

 The forester's work in this line will be in the nature of aid to the 

 skilled Federal officers already charged with this work. The rain 

 measurements on watersheds, together with the measurements of off- 

 flow from them, provided for in our forest system, will be a valuable 

 guide to an intelligent decision on the value of reservoir sites. 



(The Coast Range is with us in several places in low hills, like 

 the Mission, San Joaquin and Puente hills, and in other places we have 

 rolling lands, not profitable for crops or orchards. Certain trees do 

 well on these hills, and can be made a source of profit as well as 

 prove a prevention to gullying and torrent action. At the same time, 

 such tree plantations are likely to create springs, as was artificially 

 done by Palissy in France by tree planting.) 



