Igo BOTANICAL GAZETTE 
but fourteen good positive curves showed after 48 hours. Of 
the others, two were negative and four remained vertical. In 
a small-seeded variety of Lupinus albus, at a water temperature 
of 27°, sixteen seedlings in the revolving basins of water gave 
no curved roots during the period of 29 hours. A later expen 
ment with a large-seeded variety, temperature in the water being 
17° to 23° and the period 25 hours, gave twenty-two positively 
curved primary roots in a total of twenty-four. Each of the 
curves attained an angle of 45° or over. The velocities employed 
in the experiments with both these species extended from 50" 
to 500™ per minute. ee 
It is evident, therefore, that both these species have scan 
primary roots. Whether the varying sensitiveness observed Was 
due entirely to the different varieties, or, in part, to : ee 
to different seasons of the year, or to some other condition, W# 
not determined. Enough testing was done to show that it 
not due to difference in the water used in the experiments. 
Tropaeolum majus behaves badly in water, 25 per cent 
per cent. of the roots becoming contorted. In two &*P 
with a total of thirteen straight roots, the period of 
for one being 12 hours, and for the other 18 hours, "™ 
ture of the water being 22° to 23°, and the veloan= 
from 225™ to 625°™ per minute, no roots responded. fick 
experiment, same temperature, velocities from 100 
per minute, twenty seedlings were used. Noe : 
for 6 hours; but at the end of 30 hours, fifteen of ac 
roots were positive 15° to 19°, while the other ive WF 
vertically downward. The secondary roots § 
_ response. There was considerable irregularity 10 
of growth, but, at the end of the period, the fi ms 
‘roots showed plainly that this species SIV 
reaction. | : ee 
