AMERICAN JOURNAL OF BOTANY 
[Vol. 9 
pinna sample, the value being taken to be constant for all observations. 
Returning to the diagram of figure i, the quotient obtained by dividing 
half the length of line BC by the length of Hne AB (or by that of line AC, 
since these are equal) is the sine of half the angle BAC. From the sine 
is readily determined the magnitude of the half-angle itself (by use of a 
table of sine values), and multiplying this value by 2 gives the magnitude 
of the whole angle BAC, the angle of divergence of the two pinna wings. 
The last named magnitude, being the average for the pinna sample used, 
is the one given in the last column of the table, for each observation. 
Table i. Relation between Water Content of Excised Portions of Pinnae and Average Angle 
of Divergence between the Two Pinna Wings 
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 
Width 
of Angular 
Are Constant for the Test 
since 
Sq. Cm. 
Actual 
from 
of 
Divergence 
Excision 
of Area 
(from 
Equation of 
Pinna 
between 
(One Side) 
Weight 
and Area 
of Samples) 
Smoothed 
Rectilinear 
Graph (see 
Discussion) 
ScLmplc 
Pinna '^''ings 
Test I 
min. 
grams 
grams 
grams 
cm. 
deg. of arc 
Ave. actual width of 
0 
4.7410 
2.8938 
2.8877 
2.070 
73° 30' 
72° 6' 
71° 2' 
pinna wing, 1.73 cm. Ave. 
5 
47283 
2.8811 
2.8769 
2.036 
area of pinna sample (one 
10 
47165 
2.8693 
2.8686 
2.010 
side), 27.7 sq. cm. Ave. 
15 
47057 
2.8585 
2.8632 
1-993 
70° 20' 
69° 18' 
68° 20' 
dry weight per 100 sq. cm. 
20 
4.6989 
2.8517 
2.8549 
1.967 
of area (one side), 1.8472 g. 
25 
4.6883 
2.8411 
2.8472 
1-943 
Equation constants (see 
30 
4.6818 
2.8346 
2.8335 
1.900 
66° 36' 
66° 12' 
discussion), K = .3191; 
35 
4-6753 
2.8281 
2.8303 
1.890 
L = 2.22^2. 
65 
4.6267 
27795 
2.7824 
1.740 
60 24 
95 
4-5733 
2.7261 
2.7208 
1-547 
53° 8' 
47° 8' 
125 
4-5187 
2.6715 
2.6685 
1.383 
155 
4.4619 
2.6147 
2.6155 
1.2 1 7 
41° 12' 
185 
4.3982 
2.5510 
2.5485 
1.007 
33° 50' 
215 
4-3414 
2.4942 
2.4994 
0.853 
28° 32' 
Test II 
Ave. actual width of 
0 
4.1899 
2.3759 
2.3825 
2.677 
101° 22' 
pinna wing, 1.73 cm. Ave. 
30 
4-1239 
2.3099 
2.3070 
2.410 
88° 18' 
area of pinna sample (one 
60 
4.071 1 
2.2571 
2.2570 
2.233 
80° 22' 
side), 27.9 sq. cm. Ave. 
90 
4.0171 
2.2031 
2.2017 
2.037 
72° 8' 
64° 40' 
55° 50' 
dry weight per 100 sq. cm. 
120 
3-9571 
2.1431 
2.1488 
1.850 
of area (one side), i .8140 g. 
150 
3-8957 
2.0817 
2.0839 
1.620 
Equation constants (see 
discussion), K = .2825; 
L = 1.6262. 
Test III 
Ave. actual width of 
0 
4.0369 
2.3144 
2.3145 
2.590 
98° 52' 
87° 56 
pinna wing, 1.71 cm. Ave. 
30 
3-9813 
2.2588 
2.2558 
2.367 
area of pinna sample (one 
60 
3-9330 
2.2105 
2.2164 
2.217 
81° 6' 
side), 27.5 sq. cm. Ave. 
90 
3.8867 
2.1642 
2.1620 
2.010 
72° 14' 
64° 48' 
57° 38' 
dry weight per 100 sq. cm. 
120 
3-8377 
2.1152 
2.1139 
1.827 
of area (one side), 1.7225 g. 
150 
3-7875 
2.0650 
2.0656 
1.643 
Equation constants (see 
discussion), K = .2628; 
L = 1.6338. 
