32 BOTANICAL GAZETTE [JANUARY 
the concave side that at least prevents them from lengthening 
in proportion to the axis and the convex cortex. 
TABLE VIII. 
ROOTS BRANDED AND SPLIT INTO HALVES AFTER CURVE HAS BEGUN. 
Dat Hours aft d ed in, din, | Both d 
1897 Roots used gi. ok ag Garett £ aa fe ppogenirrel yer é 
Jan. 27 3 4 I 2 
28 6 is I 5 
29 4 I I | 
30 5 0.5 I 4 
Feb. 1 II 25 6 I 2 2 
2 7 1.5 2 4 I 
3 3 55 I 2 
4 5 : 3 2 
5 5 3 I 4 
8 5 1.25 5 
9 6 5 I 4 i 
10 Io 2 3 4 2 
69 15 29 21 4 
21.7% 42% 30.4% 5.8% 
In the experiments shown in this table, the roots were branded 
and placed in water until the curving had begun. They were 
then split into two equal parts by means of a sharp thin scalpel, 
in such a manner that one half was the convex side and the 
Curving out means that 
the tip of the half root turned away from the cut face. The 
letter z stands for the convex half, the letter y for the concave 
half of the curve that was due to the branding. The two halves 
of the same root were kept so that they were compared with 
each other, and the numbers in the right hand column of the 
table stand for whole roots, the two halves of which behaved as 
