739 
Centrifugal Force as Geo tropic Stimuli. 
Experiment 14. Jan. 20, 1912. 10.40 a.m. to 9.10 p.m. 
Temp. = 19 0 C. 
Radius of rotation at middle of box = 30 cm. 
6 = 94 0 . 
Total period (/+ T) = 15 m. 30 s. 
t , 
Y = i6 ' 3 - 
R == 3*88. 
Point of equilibrium is 3 cm. below middle of box. 
r = 27 cm. 
C = 16-4 mg. 
t C 
Thus — = 16-3, — = 16-4. 
T mg 
CT 
= i-oi. 
mg.t 
Experiment 15. Jan. 18, 1912. 10.20 a.m. to 5.10 p.m. 
Temp. = 20 0 C. 
Radius of rotation at middle of box = 30 cm. 
B = 94 °. 
Total period (/+/')= 1 1 m. 
t 
Y = I 7*'7* 
R = 3.83. 
Point of equilibrium is at middle of box. 
r — 30 cm. 
C = 17-7 mg. 
Thus r 
CT _ 
* * mg. t ~ 
1 1'l, 
1 * 00 . 
C_ 
mg 
17-7. 
Experiment 16. March 23, 1912. 11.10 a.m. to 10.20 p.m. 
Radius to rotation at middle of box = 45 cm - 
6 = 92 0 . 
Total period (/+ T 7 ) = n m. 
R = 3 - 47 - 
Point of equilibrium is at middle of box. 
r = 45 cm. 
C 21-8 mg. 
M.E.C. = 0.85. 1 
.*. C (corrected) = 18-5 mg. 
1 The mechanical error was great owing to the bands having become very loose. 
