May, 1922] 
TRELEASE INCIPIENT DRYING AND WILTING 
Table i — Continued 
Ave. Water Content 
per 100 Sq. Cm. 
of Area (One Side) 
Time 
Ave. Green 
Ave. 
Ave. 
Weight 
Apparent 
Magnitude 
Test No. and Values that 
Elapsed 
per 100 
Calculated 
Wiatn 
of Angular 
Are Constant for the Test 
Actual 
from 
ot 
Divergence 
Excision 
of Area 
Weight 
and Area 
of Samples) 
Equation of 
Smoothed 
Rectilinear 
Graph (see 
Discussion) 
Pinna 
between 
(One Side) 
Sample 
Pinna Wings 
min. 
grams 
grams 
grams 
cm. 
deg. of arc 
Test IV 
Ave. actual width of 
0 
4-5473 
2.7612 
2.7558 
1.683 
65 18 
59° 16' 
pinna wing, 1.56 cm. Ave. 
30 
4.4870 
2.7009 
2.7074 
1.543 
area of pinna sample (one 
00 
4-4333 
2.6472 
2.6580 
1 .400 
53 20 
47° 46' 
42° 52' 
34 
28° 28' 
side), 24.9 cm. Ave. 
90 
4-3837 
2.5976 
2.6106 
1.263 
dry weight per 100 sq. cm. 
1 20 
4-3363 
2.5502 
2.5681 
1 . 140 
of area (one side), 1.7861 g. 
150 
4.2834 
2.4973 
2.4920 
0.920 
Equation constants (see 
T Sr» 
1 oO 
4-2357 
2.4496 
2.4392 
0.767 
discussion), K = .3457! 
L — 2, 1 740' 
1 cbL V 
dULUdl WlULll Lil 
3-4^9^ 
1 .9^/0 
1 .9268 
1 .090 
69° 24' 
66° 36' 
piinid. wiiig, 1 .uu cm. xvVt:. 
5 
3.4100 
1. 9164 
1.9153 
1.523 
area of pinna sample (one 
1 0 
3.4028 
1.9006 
1.9084 
T '78'? 
64° 58' 
6^° S2' 
60° 56' 
side), 26.6 sq. cm. Ave. 
I 
1. 9001 
1.9038 
I 7=^6 
dry weight per 100 sq. cm. 
18 
3-3915 
1.8893 
1. 8912 
1.683 
of area (one side), 1.5022 g. 
23 
3-3785 
1.8763 
1.8787 
1. 610 
58° 0' 
56° 10' 
55° 30' 
Equation constants (see 
28 
3-3897 
1.8675 
1.8706 
1-563 
discussion), K = .1718; 
30 
3-3634 
I. 8612 
1.8677 
1.546 
L — 1. 602 1. 
36 
3-3559 
1-8537 
1.8505 
1.446 
51° 38' 
49° 44' 
48° 44' 
46° 42' 
43° 58' 
41° 52' 
43 
3-3428 
1,8406 
1. 8419 
1.396 
47 
3-3355 
1.8333 
1.8375 
1.370 
50 
3-3303 
1. 8281 
1.8282 
I.3I6 
58 
3-3207 
I.8185 
I.8156 
1-243 
64 
3-3094 
1.8072 
1.8059 
1. 186 
The equation constants given in column i and the calculated values of 
column 5 will be considered below. 
Pinna still attached. For the study of angular changes in the pinnae 
still attached to the plant, ten pinnae were selected on each of three trees 
(thirty pinnae in all), and these were measured at hourly intervals, from 
6 a.m. to 6 p.m., for six days. Ink marks on the pinna edges insured that 
the measurements would always be made at the same place. A shaded 
thermometer near the plants was read at the times of measurement, and a 
Livingston white spherical atmometer, unshaded and also near the plants, 
was likewise read. 
The data thus secured are shown in table 2. 
Discussion of Results 
Excised pinna samples. The results presented in table i show that 
excised pinnae in laboratory tests gradually lost weight as the result of 
transpiration unaccompanied by absorption, and that at the same time the 
