Centrifugal Force as Geotropic Stimuli . 
Point of equilibrium is about i cm. below middle, 
r — 29 cm. 
C = 14.9 mg. 
Thus ^ = 5-04,^= 14-9- 
CT 
' mg. t 
= 2*96. 
Experiment 22. April 3, 1911. 10 a.m. to 7.30 p.m. 
Temp. = 2 5 0 C. 
Radius of rotation at middle of box = 30 cm. 
d = 94°. 
Total period (/+ 7 1 ) = 20 m. 
= 8 ' 9 2 - 
R = 3-36. 
Point of equilibrium is about 3 cm. above middle of box. 
.-. r — 33 cm. 
C = 15*0 mg. 
/ Q C 
r = 8 ' 92 ’ mg- 
CT 
• * mg. t 
= 1.68. 
15.0. 
Experiment 23. April 5, 1911. 12 noon to 6.40 p.m. 
Radius of rotation at middle of box = 30 cm. 
6 = ioo°. 
Total period (/+ T) = 1 hour. 
L - 8-84. 
T 
R = 3-44. 
All the radicles bent down. 
.*. r > 34 cm. 
.-. C > 16-19 mg. 
Thus 4 = 8-84,— > 
T mg 
CT 
* • mg. t 
> 1-83. 
16-19. 
Experiment 24. May 8, 1911. 9.30 a.m. to 7.30 p.m. 
Temp. = 2 5 0 C. 
Radius of rotation at middle of box — 30 cm. 
0 = 94°. 
743 
3 E a 
