32 
TRANSPIRATION IN A DESERT PERENNIAL. 
TaBLe 12.—Transpiration of a branch in leaf (g) of an adult tree. 
Date, September 16, 1912. 
Experiment XII. 
Dew-point. Temperature. | Relative humidity. 
Time. T E B 
Bell-jar.| Air. |Bell-jar.| Air. | Bell-jar. Air. 
og, | cc. | op, | or. | pot. | pet 
6h 15" a.m. 37 2.7 we sass ies tes 
7 15 bee 0.00150 ) 0.0130 | 0.115 (35 2.5 if) 78 24 2i 
7 30 a.m. 2.5 2.5 79 79 22 22 
8 36 ee 00492 -0298 164 { 23 0.7 83 82 17 17 
8 45 a.m. 0.5 0.5 83 83 17 17 
9 47 om} 00789 0470 168 { 0.0 | —1.0 93 91 12 12 
9 55 am. . |f—12 | -1.2 91 91 12 12 
11 00 A, 00311 0873 055) 910 | 43 95 94 i 8 
11 10 a.m. —4.5 | —4.5 94 04 8 8 
12 15 ae 00655 -0652 -100 Loaa ~415 99 97 8 7 
12 26 p.m. 4.6 | —4.6 98 98 7 7 
1 28 oa -00566 -0690 082 lean —5.0 | 102 100 7 7(2) 
1 33 p.m. —5.0 | -5.0 | 101 101 7 7 
2 40 ea 00527 0679 076 { —4.7 | —415 | 104 102 70); 7Q) 
2 50 p.m. —4.5 | —4.5 | 102 102 7@)| 7) 
3 55 Sed 00445 0588 077 {=H3 3.2 | 100 98 7 
405 p.m. 3.0 | —3.0 97 97 7 7 
5 06 eee 00270 0450 060 Lon -15 95 94 10 9 
5 15 pm. ~1.5 | —1.5 92 92 10 10 
6 35 Hae -00100 - 0066 015 ee 2.0 80 80 15 20 
sate oy e 
b.15 yar s, 
10° Poe ‘s 
7 ° oo Raia mn rT 
05 x ee 
a 
00 
07 Te aig 
= Se 
06 a “, - 
ee SS, 
05 Zz SS 
g \ 
vA . 
04 Zz \ 
8 et \ 
7 \ 
v7 \ 
oe 7 \E 
01 \ 
00 
tAY 
t 
007 a 
, ‘ TS, 
006 / \ POSE 
+ ‘ ew 
- % i a 
[005 —— \ ~. 
a % A == 
004 0 Mee a 
, ve S 
003 + Be 
I = 
002 /” "RG ae 
001 peor 
Vv v ” Wy " u W n W ; w tt uf 
7 8 9 1 tt 2 2 #2 3 4 «5 6 
Fic. 17.—Graphs for transpiration of a branch in leaf (g) 
from an adult tree. 
Exp. XII. 
