THE REQUIREMENTS OF PLANTS 



21 



But, on the other hand, the effect of temperature on the rate of 

 growth of a plant is in no wise like its effect in accelerating chemical 

 change. Bialoblocki's (37) results with barley were as follows : 



The two curves are shown in Fig. I ; the difference between them is 



/O' 0' +10* +20* +30* +40" +50 



* Temperature 

 FIG. IA. Relation between Temperature and Assimilation. (Miss Matthaei.) 



-/0 O 6 +10 +20 +30 +40 +50 



*- Te/nperature 



FIG. IB. Relation between Temperature and Plant Growth. (Bialoblocki.) 



of fundamental importance to our subject and must be discussed in 

 some detail. 



Each of the separate processes assimilation, respiration, etc. 

 gives, so far as is known, curves like Fig. la continuous over the whole 



