1893.] Influence of Anesthetics on Plant Transpiration. 57 
Revue Générale de Botanigue. A very brief summary of his 
conclusions may be stated as follows: 
I. The luminous rays of the sun are partially utilized in as- 
sisting assimilation and partially in increasing ‘‘chlorophyllian 
transpiration.” 
2. Part of the luminous rays are absorbed by the chloro- 
phyll bodies and converted into heat, increasing vapor tension 
and thus aiding transpiration. 
3. The same dose of sulphuric ether acts differently on plant 
transpiration in the light and the dark. In light transpira- 
tion is increased but in the dark retarded. 
4. Augmentation in light of transpiration of the anesthet- 
ized plant is due to the influence of the sulphuric ether on 
the chlorophyll bodies 
5. The cause of retardation in the dark is not definitely ex- 
plained. 
6. Ether retards assimilation but increases chlorophyllian 
transpiration (in the li ht). 
7. Ether partially arrests assimilation and the luminous 
rays no longer used in the assimilating function aid the chlo- 
rophyllian transpiration. 
- The same results are reached when assimilation is re- 
tarded by any means. 
s will be seen from these conclusions, Jumelle adheres to 
the chemical theory of chlorophyllian transpiration as do also 
‘esner and others. Pringsheim, Kohl, and others maintain 
that the influence of chlorophyll is purely mechanical, acting 
aS a sort of a shade to protect the plastid from certain rays of 
sunlight. It isa well known fact that plants transpire, though 
i chlorophyll, as in etiolated plants. The question 
furthce Pane theory of plant transpiration need not be 
Ging ship here. I simply wish to show how Jumelle 
has dag — I think are erroneous conclusions. Jumelle 
wink a © Deen Carrying on a controversy with Verschaffelt 
ai well a. masts that ether increases transpiration in the dark 
sire 40 taek pene This Jumelle has attempted to dis- 
By bigial oa Paper on anesthetized plants. 
phate tare ‘t1cism it must be pointed out that, in the first 
plane ts 4 © as well as Verschaffelt used only portions of 
little shes experiments and hence their conclusions are of 
caiSheacics a value. In the second place they very possibly 
evaporation with transpiration as I shall attempt 
eee SVT ty 
