: Fig. 4 shows a tracing from a photographic repr 
seedlings in one of the foreging experiments, 
ee 
, shown the first curving later than 8 hours. Not 15 i 
‘ those responding have shown a curve earlier than 6m . 
greatest angle that any of my seedlings of Vicia ng 
_ 70°; the most of them have reached a deviation 
_ A number of its roots grow crooked in water, 
_ long, and a considerable number of its roots aF© 
_ It shows, however, a higher percentage of curvat age 
to the stimulus, and the angle attained by the °° 
194 BOTANICAL GAZETTE 
The experiments with Vicia sativa may be divided into two 
groups: those of a duration of 6 hours to 12 hours, and those 
of 48 hours. Forty-seven seedlings have had their roots stimu- 
lated by currents of water ranging in velocity from 150™ to 
750™ per minute, water temperature 19° to 25°, period from 6 
to 12 hours, giving twenty positive and twenty-seven neutral : 
roots. Had the revolution of the basins of water been continued — 
longer, it is certain that other roots would have become ti . 
as is shown by the following results: Eight seedlings had thes 
roots subjected to the streaming of water ina revolving basit . 
for 48 hours, water temperature 18° to 21°, velocity Agee 
500 per minute, giving seven roots positive and one negative 
In another experiment, out of thirteen seedlings only two showed 
curves after 12 hours’ revolution of the basin, while after another 
12 hours ten roots had become positive. It is safe to assume 
that over 75 per cent. of the roots of Victa sativa are respe a. 
to the flowing of water, whereas only 50 per cent. of those: 
Vicia faba are responsive. eS Ss the 
Both of these species are alike in, the long duration of = 
latent period and in the smallness of the angle of curva 
is certain that in my experiments with these two. pst 
water temperature of 20° and an air temperature ee : 
higher, more than half the roots to respond rheotr 
L 
pg 
oduction 
restriction contained in the description accompan} 
is fairly representative of the behavior of this | 
Pisum sativum resembles in its general beha' 
