266 BOTANICAL GAZETTE (aren 
velocities above 600™ per minute, the angle was less than in the 
lower rate. : 
The lowest speed to which any of the roots will respond 
with well-marked curves has been determined in another series — 
of experiments. The same general method was used as before, — , 
except that a klinostat gave the revolution, and no seedlings — 
were set nearer than 3 to the center of the dish. The seed- 
lings were thus suspended across the diameter of the basin in 
7 four groups, two being in the outer circular channel 45™ i 
—— radial width, and two being in the inner channel 35™ wide, 
there being an unoccupied central portion of water 55™ in 
diameter. The innermost roots that were 3™ from the center | 
were therefore within 5™" of the inner glass wall, and hence it 
may be assumed that the friction of the water on the glass wall. 
_would maintain there a water current with fairly | ~— 
tion, even in this slow movement. a 
In the following table the roots are grouped in two ede : 
_ those in the outer channel of the revolving basin whe there 
_ was a velocity of 2.36™ to 4™ per minute, and those in the -~ 
2 channel where the velocity was 1.18™ per minute to a pe 
Sete. oe 
TABLE IV. 
: EXPERT WITH a ALBA, to show the lower + ink fe 
a sa re . 
_ Venocrrres = 1.18cm To 2°m PER MIN. 
i) 
3 Su ~ 
Sal oe 2 
os Lng : oe . 
a+ He oP 
2% wa c= 
4 al Zz 
° 
| 
+ 
| t0° to 45° || 8 = + 
a 
3 
15° to 45° ||14 = + 
: 3-0 * 
