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1893.]  Jnfluence of Anesthetics on Plant Transpiration. 61 
2. Solanum tuberosum, small plant, eight leaves, no tubers; 
in diffused light. 
Tem. of Normal|Time in seconds required to : 
Time| water —_- or evaporate 5™m of water sgh ie a Progress. 
a * |Anaest. column. z 
II 21 4.5° |Normallro, 11, 11, 10, 12, 1%, 10, 12, II 10.8 lnétses introduced 
11:14 | 21349 | 24.5° |Ether, |xx, 11, 10, 11, 11, 12, 11, 12, 12 11+ After 10 minutes 
1:18 | 214° | 24.5° |Ether, |16, 17, 17, 16, 17, 17, 16, 18, 17 167-9 ether removed. 
11:23 | 214° | 24.5° |Normal]16, 16, 14, 13, 13, 12, 11, 10, 11 16-10 =|End. 
Ether introduced and left until 2 Pp. m. 
an0'| 33° 24.9° |Ether. 175, 73, 75, 72, 70, 73, 73 Ether removed 
-35 pea 24.9° |Normall75, 70, 73, 71, 74, 73. 72, 72 after 10 min. 
2:30 | 23 24.9° |Normal] 36, 35, 36, 32, 35, 34, 34. | 325 |End. 
It will be seen that the plant did not return to its normal 
transpiration after it had been exposed to ether vapor from 
11:30 A. M. to 2:00 P. M._ The ether had partially killed the 
plant as the subsequent drying up and shriveling of the tips 
and margins of some of the leaves served to indicate. 
_ 3. Solanum tuberosum, small plant, six leaves, no tubers; 
in direct sunlight. 
Tem. of|Tem. of|Normal|Time in seconds tequi 
‘ n quired to 
Time water,| air, | oran-| evaporate 5mm of water pon. Progress. 
c. Cc. | eesthet. column. é 
2:30 we 
S 22% 30° |Norm’l| 5, 6, 5, 6, 5, 5, 6, 5, 6, 6, 5) 5... 6.1 Ether introduced 
pe ee oe Ether ..| 6, 5, 6, 6, 6, 7, 7, 8” 8, 9. 8, 9,99 6-9 Ether removed. 
2:38 | aa(zo | 30, |Norm’l| 8, 8, 7, 6, 6, 5, 6, 5, 5, 6, 6, 5... ees 
ayo | azide | 309 (Chi'frm| 5, 5, 6 5, 6, 6. 5, 6, 7. 6, 7,7, 8, 9] 6-9~ |ChloroPmrem’y 
galt Boa 30° Norm’! | 8, 8, 7, 7, 6, 6, 5, 6, 5, 5y 6, Seem agers 
These experiments seem to show conclusively that a plant 
€xposed to the vapor of ether, amyl nitrite or chloroform, 
will have its transpiration very materially diminished. I took 
no special notice of the amount of anzesthetic used because I 
Soon found that the effect was the same independent of the 
quantity used. Of course a small quantity required a longer 
time to produce given effects. Ether and chloroform I poured 
many vessel from which it could evaporate. Amyl nitrite 
Was used by putting two or three drops of a piece of cotton 
eps = bell jar. It will be remembered that during all 
thet ic a current of dry air was passed through 
was tae carrying with it most of the vapor; still there 
l wacient left to produce the given results. Exposing the 
Pee Poamy) niteite vapor for ten or fifteen minutes was suf- 
