20 



at the higher températures. As one may assume approxi- 

 mately that at other températures the velocities of assimi- 

 lation are related in the same way as at this low température, 

 ail the results obtained can be reduced to a standard-value 

 and so become comparable. 



Now at the beginning of every experiment we always 

 fixed the velocity of assimilation at 24^ C. and finally we 

 hâve calculated ail values supposing that at 24° C. the 

 shoots assimilated at a rate of 0.200 mgr. Oo per minute. 



The results are given in the Tables V and VI, the fîrst 

 of which is divided in 4 superdivisions according to the 

 separate séries of experiments. The last column of Table V 

 shows the average of the 3 observations about the rate 

 of assimilation at 24° C. In Table VI the recalculated 

 velocities of assimilation are given. 



Fig. 3 gives a diagram of the numbers of this last table, 



X 



^^ 



^ 



in which the uncertainty of the numbers, based only upon 

 a few experiments, must be taken into considération. 



From Table VI and from our diagram it follows flrstly 

 that damage of the assimilation-function only becomes 

 perceptible at about 38° C. after the maximum time of 

 heating which was used, viz about 40'. 



