1900] MECHANISM OF ROOT CURVATURE 24 
TABLE IV; 
ROOTS GASHED ALL AROUND IN CORTEX ONLY, AND BRANDED 
; ON. ONE: SIDE) OF “THE “TIP. 
Date iar ht of gash| Hours after | Roots used | Roots curved| Curved onl 
: rom tip branding below gas 
1896 
Nov. 13 4 8 0 6 
14 6 6 fe) 4 
16 24 16 fe) 8 
a7 5 16 0 few 
18 aie 7 6 I 5 
20 7 9 0 7 
23 6 12 2 8 
25 2-3 6 10 7 2 
26 3-4 5 9 4 3 
28 4 4 10 I 8 
28 2 24 9 3 3 
30 2-3 5 8 4 1 
Dec 7 3-4 6 Io I I 
7 2 12 10 I ? 
8 2 7 10 3 ° 
8 3-4 10 10 2 7 
10 2-3 6 10 3 I 
Io 3-4 6 10 fo) 7 
15 2-3 5a 20 4 3 
17 2-3 V 20 7 Co) 
1897 
March 17 2-3 6 3 a1 
225 46 76 
20.4% 33-7% 
In this table the third column indicates the number of hours 
after branding when the observations here recorded were made. 
These were not necessarily the only observations, as with nearly 
all lots several observations were made at intervals of two or 
three hours, then again after twenty-four hours, In making up 
the tables those results were taken which showed the largest 
number curved. The column headed ‘roots curved” shows the 
number that curved both above and below the gash. The last 
column shows the number that curved between the gash and the 
tip in addition to those in the preceding column. 
It is seen that in these roots in which the cortex is cut off 
as completely as possible only 20.4 per cent. of the roots curve, 
though the axial cylinder was practically all present. Owing to 
