40 TRANSPIRATION IN A DESERT PERENNIAL. 
Parkinsonia 
a & 
‘taal 7 Picrie 
+ 4.0 Alcohol 
VIxw 
3.2 
t 2.4 _» Picrie 
~~ Alcohol 
L 1.6 age 
+ .8 
Cissus 
t 5.6 
t 4.8 
L 4.0 Pierie 
fees al = Alcohol 
+ 2.4 
L 1.6 Leexs Picri¢ 
w pie ===- ~~~ 77 Alcohol 
+ .8 
L z 1 i. L L 1 oes ae r 
1 
8 9 1 ll 12 1 z 3 4 5 6 7 8 9 
Fic. 19.—Comparison of picric-acid method for stomatal measurement with the absolute 
alcohol method. 
st, EX: XVI 
t2.4 
r 1.6 
203.2 Ex. XIV 
L = 1 i 4 1 1 1 1 1 1 1 
eae 7 8 9 10 dW 12 #1 2 3 4 
Fic. 20.—Graphs for stomatal openings and relative trans- 
piration. Exps. XIV, XVI, XVII. 
