Carbon Assimilation. 
151 
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 
Fig. 10. Curve showing initial assimilation maxima at different tempera¬ 
tures. For further explanation see text. (After Blackman). 
