CLIMATE AND PLANT GROWTH. 



29 



of the curves in the case of the oak-brush and the aspen-fir types, and 

 (2) the decreased range or flattening of the curve in the spruce-fir 

 type. 



It is not possible by a review of the monthly mean temperatures 

 to form a mental picture of the relative growing and nongrowing 



TYPE 

 EH OAK- BRUSH 

 Ml ASPEN- FIR 

 ESI SPRUCE-FIR 



FIG. 13. Summation of temperatures above and below 40 F., 1916. 



temperatures ; that is, the temperatures above or below 40 F. These 

 are summarized in Table 9 and graphically represented in figure 13. 



TABLE 9. Summary of temperatures above and below 40 F. 



