Curvature of Roots, 427 
Experiments and Observations. 
The record of experimental work is given without much 
attempt at classification, but the experiments are grouped 
and numbered in such a way as to admit of convenient com- 
parison and discussion. Only a comparatively small number 
of the experiments actually conducted are here described, 
those being selected that give the clearest impression of the 
results as a whole. Brief comments are given in some cases 
where it has seemed better to call attention to important 
points in direct connexion with the experiments, than to 
postpone this to the pages devoted to formal discussion of 
results. 
Miscellaneous Experiments with Radicles of Seedlings . 
1. Twelve peas with radicles ranging from 2 to 4 cm. in 
length were branded with a hot glass rod as follows : — 
Nos. 1-4 branded 1 mm. from apex of radicle. 
55 5“^ 5J ^ 53 55 
55 9~ 12t 55 3 55 55 
When examined twenty-two hours later, it was found that 
Nos. 1 to 4 were all curved, with the convexity on the branded 
side, while all the rest, Nos. 5 to 12, with the single exception 
of No. 9, were sharply bent at the branded spot and were 
concave on that side. 
2. Eight specimens of Vicia Faba with radicles ranging 
from 5-6 to 7-4 cm. in length 
following table : — 
were 
treated as shown 
No. 
1 branded 
1 mm. 
from 
apex of radicle. 
55 
1 
55 
55 
55 
3 » 
i*5 
55 
55 
>5 
4 
i*5 
55 
55 
55 
5 
2 
55 
55 
55 
6 „ 
2-5 
55 
55 
55 
7 
3 
55 
55 
55 
8 ,5 
4 
53 
35 
Special care was taken not to burn too deeply, but in every 
G g 2 
