Centrifugal Force as Geotropic Stimuli . 
Experiment 27. Oct. 18, 19 n. 9.20 a.m. to 6.30 p.m. 
Radius of rotation at middle of box = 30 cm. 
0 =' 94 °. 
Total period (/+ T) = 40 m. 30 s. 
t 
Y = 9 ‘° 5 - 
R = 3 ‘ 55 - 
All radicles bent down (except two which grew irregularly). 
r > 34 cm. 
C > 17-2 mg. 
i C 
Thus — = 9-05, — > 17.2. 
1 mg 1 
CT 
Experiment 28. April 7, 1911. n a.m. to 6.30 p.m. 
Temp. = 2 4 0 C. 
Radius of rotation at middle of box = 30 cm. 
e = 94°. 
Total period (/+ T) = 1 hour. 
/ 
Y = f*°7- 
R = 3*58. 
All the radicles bent down. 
.-. r > 34 cm. 
C > 17-54 mg. 
Thus ^=7.07,^ >17.54. 
C7 
.‘. > 2-48. 
mg. t 
Experiment 29. Oct. 2, 1911, 10.30 a.m., to Oct. 3, 10.5 a.m. 
Radius of rotation at middle of box = 30 cm. 
0 = 94 °- 
Total period (/+ T) = 40 m. 30 s. 
t 
Y = II * 11 - 
R = 3-70. 
Point of equilibrium is near the top of the box (rather doubtful). 
.-. r = about 34 cm. (?). 
.-. C = about 1 8-8 mg. (?). 
/ C 
Thus — = ii-n, — = about 18-8 ? 
T mg 
CT 
= about 1-7 (?). 
mg. t 
