Ill] REGENERATION, OR GROWTH AND REPAIR 141 



occurred, between the time of injury and the first measurement 

 of regenerative growth ; or, for all we yet know, regeneration 

 may have begun at once, but with a velocity much less than that 

 which it afterwards attained. This apparently trifling difference 

 would correspond to a very great difference in the nature of the 

 phenomenon, and would lead to a very striking difference in the 

 curve which we have next to draw. 



The curve already drawn (Fig. 35) illustrates, as we have seen, 

 the relation of length to time, i.e. LjT = F. The second (Fig. 36) 

 represents the rate of change of velocity; it sets F against T ; 



