leat ll An 0 we ean) (ai 
a 
St Ne ee 
a a i Bl re ea 
Se Se Ae ee ee ee ee ae ee Ee meee 
1900] MECHANISM OF ROOT CURVATURE 19 
observed at the same time as other sets, which will be shown in 
other tables, and these acted as control experiments for each 
other. For instance, those in which the brand was on the Oppo- 
site side from the gash served as control for those in which the 
gash and brand were both on the same side. 
A total of one hundred and eight roots were gashed in the 
manner indicated in the table, and branded on the opposite side of 
the tip. Whatever traumatropic effect the gash would have on 
the root would, in this case, work against that of the brand. Of 
these roots forty-nine, equal to 45.3 per cent. of the whole num- 
ber, curved away from the brand both above and below the gash. 
These roots were tested in lots, the number varying from three to 
seventeen in each lot. The observations must be made within 
five or six hours after branding, for after that time some that 
have shown the curve more or. less plainly begin to straighten, 
and after twenty-four hours a much smaller number will show 
the curve above the gash. 
TABLE II. 
ROOTS GASHED THROUGH AXIAL CYLINDER. 
Rp pe | 24 
Control, gashed, not 
ded 
bran 
Date 
Distance of gash from tip} Roots used | Roots carved Roots used | Roots curved 
1896 
Nov. Io gmm 5 I 
II 7 4 5 I 
12 8 4 
13 5 re) 
14 6 I 
16 12 9 
23 5 4 
25 II 5 
7 
March I9 2-3™m 9 4 9? 8 
2-35 8 6 8 I 
76 38 
This table shows that 50 per cent. of the roots curved both 
above and below the gash, when the brand and gash were on the 
* These nine were branded, but not gashed. 
