26 TRANSPIRATION IN A DESERT PERENNIAL. 
; 
Experiment VIII. 
. Subject, plant No. 1; area, 52.95sq.cm. Atmometer No. 812, equivalent 
to 143 sq. cm. of free water-surface. Situation, in the shade in a well- 
lighted room of the laboratory. 
TaBLE 8.—Transpiration of potted plant No. 1, in the shade. Experiment VIII. 
Date. | Time. rg E 2) |e 
Apr. 23..) 5b 24Mp.m.] ...... | ..200- | weeee i 
Apr. 24..) 9 59 a.m.| 0.0022 0.0091 0.241 77 
T E T 
E . 
.80 z 
wo 
75 » 
70 
65 : 
,; 
t 60 ! 
Bs) * 
T 
50 . &E 
45 
t.008 = .40, i rae 
: A \ 
f.007 35 i awa N 
: a > ‘i 
t.006 30 : o a 
: on 
005 25 | g 
004.20 of 
/ 
r.003 15 7 
Me 
f-002 10 E 
= 
+.001—.01—.05 t er ea 
- ~~ ~~ Fiat rag ie v 
oh 
3. 9  W ili 1 2 3 4 
Fia. 12.—Graph for shade transpiration of potted plant No.1. Exp. VIII. 
ExpERIMentT IX. 
Subject, four potted plants, Nos. 1, 2, 3, and 4 (see plate 1B). Plants 
Nos. 2 and 3 had the same history as No. 1, while No. 4 was the only survival 
of some 30 which had been taken from their natural position in the soil and 
placed in pots several weeks before. No. 4 was a seedling which had germi- 
nated in the spring of 1910. It was in full leaf at the time of transplanting, 
