436 Spalding. — On the Traumatropic 
behaviour of the radicle was in general the same as in cases 
in which it was simply branded and placed in water, except 
that after the long period in the cast the traumatropic curve 
was very near the end. The root-cap was ruptured, shreds 
of it still remaining attached, and the fact that internal 
changes had continued, while increase in length had been 
stopped, was still farther indicated externally by the irregular 
surface and the compact structure of the tip of the root. 
Twenty-three hours later, i.e. forty-one hours after its re- 
moval from the cast, the radicle was examined and drawn 
(Fig. 14). Comparing this sketch with the preceding one, 
both drawn natural size, it is seen that the lower part of the 
radicle, in something less than twenty-four hours, had elon- 
gated 7 mm. The burnt tissue at .r is now sharply delimited, 
regeneration already being far advanced. 
21. Two specimens of Zea Mais were removed from casts 
in which the radicles had been confined seventy-two hours 
after branding. After growing in water twenty-four hours, 
both were deflected. The one that had grown most is 
represented in Fig. 15. The other measured only 4 mm. 
from the bend to the extremity of the tip, but it was quite 
as distinctly curved, and at about the same angle as the one 
figured. Both were straight when taken out of the casts, and 
were not plainly bent five hours later. Figs. 16 and 17 
represent the root as it appeared forty-eight hours after 
removal from the cast. At the end of this period (cf. Fig. 1 7) 
regeneration was far advanced, although a piece of dead tissue 
remained that was afterwards thrown off. A shallow groove 
could be readily traced from a to on the branded side, and 
after ninety-six hours this could still be followed, though 
becoming less and less distinct, as far as the tip. 
22. Two specimens of Vicia Faba were branded and placed 
in casts, in which they were allowed to remain twenty-nine 
hours. When examined sixteen hours after release from the 
casts, having grown meantime in water, both were strongly 
deflected. As in the case of other species confined for 
a considerable time in casts, it was observed that the curva- 
