20 RURAL CALIFORNIA 



point of view of crop production through several 

 subdivisions of the State as indicated on the ac- 

 companying regional map (Plate III). The descrip- 

 tions of the divisions that follow will also include 

 references to the meteorological factors * of tempera- 

 ture, rainfall and the resort to irrigation when needed 

 to meet the moisture requirements of different crops. 

 The following statement of agricultural subdivi- 

 sions of California, prepared by the writer after four 

 decades of local observation throughout the State, 

 was first published by the California Experiment Sta- 

 tion in 1914 and is presented herewith with revisions 

 suggested by later experience. Grouping local cli- 

 matic conditions in their relation to crop production, 

 the State may be divided into five regions, in which 

 there will be some climatic features common to all, 

 though they severally manifest sufficient differences 

 of climatic conditions to determine roughly particu- 

 lar agricultural adaptations in all of them, viz : 



1. Northwest Coast region. 



2. Central Coast region. 



3. Southern Coast region. 



4. Interior Valley region. 



5. Mountain and Plateau region. 



The Northwest Coast region. 



This section is hilly and mountainous, being cov- 

 ered principally by the Coast Eange and its foot- 

 appendix B is arranged to show typical differences at sim- 

 ilar latitudes and striking similarities, according to topo- 

 graphical conditions, with great differences in latitude. 



