bi 
. 
ap 
Mga, Published in Publica 
1893. 
Evaporation of Water from Plants. 305 
light not passed through glass or alum solution) had a much 
greater effect. In some cases, as in the petiole of the ban- 
ana leaf in direct sunlight, the temperature was 20°C. higher 
than the air. The temperature decreases as the intensity of | 
the light. 
Green tissue warms much more rapidly than it cools. Liv- 
ing green tissue of cactus and castor-oil plant warms more 
rapidly than dead tissue of the same, but cools at about the 
same rate. The dead tissue follows very closely the temper- 
ature fluctuations of an equal bulk of water enclosed ina 
smoked glass cylinder. Checking evaporation causes a rise 
of ‘emperature proportional to the decrease of evaporation. 
The investigations that I made last year on the evolution of 
bubbles of gas by green plants, in water, exposed to light,*® 
showed conclusively that this evolution of bubbles, from such 
ory of M. Jumelle’s results. ! 
on th Jumelle's next work was on the influence of anaesthetics 
— ‘transpiration of plants. His apparatus was simple, 
ings thee of a bell glass set ina dish of mercury. The open- 
a the top of the bell glass for the introduction of 
"a = © and carbon dioxide were under absolute contral 
Plant experimented with was placed under the bell glass 
F evaporated collected by calcium chloride. In 
ots on chlorophyllian transpiration in the pres- 
- But in the experiments with anesthetics 
the loss of weight of the plant would not 
. “ases M 
ic Necessq 
ssimilati ) 
honed arted again. e results of these investiga- 
that in the light the effect of the anesthetic was 
tion II of the Nebraska Academy of Sciences, 
