Curvature of Roots. 439 
When examined twenty-four hours after removal from the 
casts the following was found to be the condition : — 
No. 1 distinctly deflected. 
„ 2 strongly curved towards branded side. 
„ 3 „ deflected. 
,, 4 straight. 
j ? 5 33 
„ 6 deflected. 
„ 7 deflected obliquely. 
Of the seven radicles, then, the two that had made the 
longest growth were straight, and of the five remaining ones 
four were deflected and one curved towards the injured side. 
27. Eight specimens of Lupinus albus were branded and 
then placed in casts, in which they remained forty-three hours. 
They were then removed from the casts and divided into two 
lots of four each, the first lot being decapitated and the second 
not. When examined after growing in water twenty-four 
hours it was found that all were alive and had grown quite 
uniformly, the greatest increase in length being 9-5 mm. and 
the least 5 mm. Of the four decapitated specimens two were 
quite strongly curved, but obliquely instead of directly away 
from the branded side. Of the four control specimens that 
were not decapitated three were strongly deflected, the fourth 
remaining nearly straight and appearing on closer inspection 
not to have been burnt enough. 
From the results of these two experiments (26 and 27) it is 
clear that decapitation immediately after removal from the 
casts of roots previously branded does not necessarily prevent 
traumatropic curvature. That it should be less regular might 
naturally be expected. Evidently the presence of the root-tip, 
with at least the greater part of the burnt tissue, is not 
necessary. So far as the evidence goes it favours the view 
that induction takes place when the growing-point is stimu- 
lated by wounding, and that the condition thus induced in 
the zone of rapid growth remains effective for a period of 
some days. As yet, however, it appears impracticable to 
