76 



Carbon Assimilation. 



assuming that the van't Hoff rule is followed above 25°C we can 

 obtain by calculation the initial values for assimilation at higher 

 temperatures. 



Secondly the initial assimilation at a high temperature may be 

 determined from the values actually measured after various times. 

 At any temperature the curve between time and assimilation is 

 plotted and the curve continued back to a point where the value of 

 the time is zero : the value corresponding to this is the initial 

 assimilation. 



Blackman's diagram illustrating these methods is shown in 

 Fig. 10. The broken line is the temperature assimilation curve 



o 

 o 



E 



15° 



25- 3S» 



Tempkrature. 



Fig. 10. Curve showing initial assimilation maxima at different tempera- 

 tures. For further explanation see text. (Aftei* Blackman), 



