CLIMATE AND PLANT GROWTH. 



51 



recorded in the spruce-fir type, while in the central type the physio- 

 logical temperature efficiency was intermediate. Since a habitat with 

 low-growing- temperatures requires a greater number of days for the 



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64- Days 







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Oak-Brush Type Aspen -Fir Spruce -Fir 



Days For Appearance Of Heads 



Femperafure Above 40 F. 



Averaae Daily Mean Tenoperafure 



Fig. 27. — Kelation of temperature to time of first appearance of blossoms in peas. 



plant to reach a given stage of maturity than a warmer situation, it 

 is evident that the physiological temperature indices would be in in- 

 verse ratio to the time required to bring the plant to a given stage of 

 maturity'. 



