742 Hiley . — On the Value of Different Degrees of 
Experiments with Helianihus annuus radicles, using total periods of more than 
twenty minutes. 
Experiment 19. May 11, 1911. n a.m. to 8 p.m. 
Temp. = 25° C. 
Radius of rotation at middle of box = 20 cm. 
6 = 9 6°. 
Total period (/+ T) = 1 hour. 
t 
f = 3- J 2. 
R — 3-61. 
All the radicles bent up. 
.*. Point of equilibrium is below the lower edge of the box. 
r < 16 cm. 
.\ Cent, force < 8-41 mg. 
C < 8-46 mg. 
Thus ~ — 3.12, — < 84.6. 
1 mg 
CT 
Experiment 20. April 6, 1911. 11 a.m. to 8.30 p.m. 
Radius of rotation at middle of box — 30 cm. 
6 = 1 oo°. 
Total period (f+T) = 1 hour. 
t 
T ~ 1 * 14 ’ 
R = 3 - 41 - 
Point of equilibrium is about 2 cm. below middle of box. 
r — 28 cm. 
C = 13*1 mg. 
T . t C 
Thus ^ = 7.14, — = 13.1. 
CT 
* ‘ mg. t 
= 1 - 83 - 
Experiment 21. Oct. 19, 1911. 12.30 p.m. to 10.30 p.m. 
Radius of rotation at middle of box = 30 cm. 
0 = 94°. 
Total period (/+ T) = 40 m. 30 s. 
t 
Y = 5 *° 4 - 
R = 3 - 57 - 
