presented to them. * This room was also closed and darkened 
that neither currents.of air nor morning light should interfere 
with the accuracy of the experiments, 
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a shape given in the figure, having a funnel a, 
at the top, and,an elbow , at the bottom, form- 
; ¥ ing an obtuse angle. These were about an inch 
in diameter, similar in size and shape, and the 
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and other materials, an elbow of tin was em- 
ployed, and then the straight tubes fitted with 
acork. ‘To test the effect of colors, tin tubes 
were painted of various colors, and in some 
te _ low, were tried. When in use the tubes were 
: held ina nearly vertical position, about five 
Ze. inches apart, one filled with well-water a few 
es 
it temberature of the air in the room. The plant was placed 
joe © beginning of the experiment so as to be midway between 
© tio tubes, not exactly parallel with them, but crossing their 
Plane at a low angle. It was allowed to remain without disturb- 
ance from 9 P.M. until 7 a. M., and its position, the temperature 
mo air and the water in the tubes and other conditions accu- 
Y noted at the beginning and close of each experiment. 
to avant 
experiment 
ty-six 
Convo ) us, and twenty-three with Phaseolus. These gave ie,” 
ny 88 results confirmatory, that-is, th 
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