Carbon Assimilation. 
»53 
while for the fourth hour it is given at 30-5"C. Thus the optimum 
value obtained will depend upon the time that has elapsed between 
the commencement of the experiment and the measurement of the 
Fig. 11. Curves of assimilation and respiration of Helianthus and Cherry 
Laurel at different temperatures. A, curve of initial assimilation maxima for 
Helianthus-, B, the same for Cherry Laurel; C, curve for assimilation of 
Cherry Laurel two hours after the initial moment of heating to the particular 
temperature; D and E, temperature-respiration curves for Helianthus and 
Cherry Laurel respectively. (After Blackman and Matthaei). 
