TEMPERATURE 



12 



there is a continuous rise in the respiration of seedlings of all 

 ages, which rise is followed by a fall ; at temperatures above 

 20° C. and up to 40 C. the amount of carbon dioxide evolved 



1 2 3 



HOURS 



Fig. 6.— Respiration of the pea at various temperatures. 



fluctuates : a rapid fall occurs in the first two hours, then a 

 rise for one or two hours, followed by a continuous fall. At 

 still higher temperatures there is a continuous reduction in the 



