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1893.) Influence of Anesthetics on Plant Transpiration. 65 
phere. I cannot agree withhim. Of course any one knows 
that in a saturated atmosphere moisture can not be given off 
as vapor. That would be a mechanical impossibility. It is 
also quite difficult to saturate an atmosphere evenly and com- 
pletely with moisture. A bell-jar was not equally warm on 
all sides under the most favorable circumstances I could bring 
to bear upon it. At no time did transpiration approach zero 
after all the conditions of the experiment had been properly 
accounted for. In the following experiments the plant was 
exposed to diffuse sunlight. 
1. Solanum tuberosum; small plant, strong roots. 
Tempe’tur: me i i ired 
ie P ie Condition of |Anzst.|Time, in seconds, required to 
ime atmosphere or evaporate 5™m of water ' Progress. 
*  |normal column. j 
Air |Wat’r 
Ales GS 
mal)7, 8, 7, 7, 8, 7, 7,8,7,8,7,7.8,7;7,7,8|In sat. atm’e 
i 24.5 24° Dry Nor 
04 | 24.5 | 24° |Gradu’lly saturat’d| Normal|7,8,7,7 8,8,7,8,8,7,8,8,8,9.8 i 
; ,8,7.7 8,8,7,8,8,7,8,8,8,9.8,9,9--.... After 5 min. 
es 24.5 24° More saturated....../ Normal|10,10, 11, 10,11, 11, 11,12, 11,12,13,13 |After ro min. 
pn #49 ane More saturated...... Normial|24, 24, 25, 26, 27, 29, 32, 35, 34...--|After 1 hour 
ie = 23° | ically ur’td| Normal|34, 36, 35, 36, 34, 32, 36, 37, 35---..|exp’dtoether 
be “ 23" Practically satur’td| FE ther.../35, 38, 49, 64, 68, 78, 82, B4...-+.0-. Eth, remov’d 
| 22%, jPractically satur’td| Normal|34, 35, 35, 30, 32, 35, 36, 34, 35-----| nd. 
Fuchsia sp.?; small plant, strong roots, no flowers. 
Time — hd Condition Aneest, | Time in seconds, required to 
on “a of atmos- or evaporate 5m™m of wa- Progress. 
phere. {normal ter column. 5 
| 
10:15 21.59 oO 
por <i: x . a Nor |9:8,8, 8,8,9,9,8,9,8,9,8,9,8.8 |Plant moistened. 
11:30 | 22 pa hh Bal 4 Normial'14,14,15,14,15,15,16, 16,18,17,18,19 After one hour 
tie tae ie hava sat’ -|Normal 32, 31, 33, 31, 30, 33, 31, 32, 30.33} ether introduced. 
12:00 | 22.5 | 22° ony sat’d. Ether... 60, 66, 64, 67, 70, 68, 70, 74, 78..... /Removed. 
12:15 | 22.5 | 22 et pe hes Normal 30, 31, 32, 30, 32, 31. 32, 30, 31.-...;Amyl n. introduced 
12:30 | 22.5 | 22.5 |Prac. at d. Amyln. 75, 64, 70, 76, 74, 70, 75, 76, 74, 71 Amyl n. removed. 
fe ac. sat’d.| Normal 33, 32, 34, 31, 32, 31, 34, 32, 33....\End, 
SI 
oo 
gb ig 
hese experiments showed that moisture did not affect the 
influence of ethe soy 
; ra 
Piration, nd amyl nitrite vapors on plant trans- 
IV. Experiments on transpiration of leaflets. 
Finally, 
uberosum leaflets. There is no mechanical difficulty 
ents, but they require close ob- 
onclusions. The object of these 
