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 



JUNE 



JULY 



AUG. 



SEPT. 



TYPE 

 CZI OAK- BRUSH 

 mt ASPEN- FIR 

 ^ SPRUCE-FIR 



Fig. 13. — Summation of temperatures above and below 40° F., 1916 



SUMMARY 

 (JULY— SEPT.) 



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. 



Month. 



June 



July 



August 



September. 



Total 



Temperature segregations. 



("above. 

 \below . 

 ("above. 

 \below. 

 ("above. 

 \below. 

 fabove. 

 \below. 



("above. 

 \below. 



Oak- brush 

 type. 



op 



11,400 



350 



16,919 



15 



14, 929 







10, 222 



640 



53, 470 

 1,005 



Aspen-fir 

 type. 



°F. 



9,347 



767 



13, 773 



42 



10,357 



74 



6,838 



1,034 



40,315 

 1,917 



Spruce-fir 

 type. 



5,090 

 1,399 

 8,843 

 73 

 7,874 

 103 

 3,505 

 1,786 



25,312 

 3,361 



