380 McLean . — Field Studies of the Carbon 
Table IV ( continued ). 
SERIES 3. — Three pinnae of leaf 6, 373*36 sq. cm. area. 
Tested on May 21. 
Hour o) 
removal 
from ap- 
paratus. 
Acid required to 
neutralize 25.07 c.c. 
of£a(OH) 2 . 
- Time 
measured. 
Spread of lower edges 
of adjacent pinnae. 
Weather conditions. 
Test. 
Control. 
a.'m. 
c.c. 
c.c. 
cm. 
cm. 
cm. 
6.30 
16.50 
16.70 
6.30 
2.70 
2-90 
2.85 
5.45, sun up. 
6.15, sunlight on leaf. 
8.30 
16.80 
,, 
2*85 
3.0 
3*io 
16-70 
8.30 
2.30 
2*50 
2*50 
8.20-8.40, dull. 
j 6-75 
16.70 
,, 
2-60 
2.65 
2*80 
8 40-9. 1 2, bright sun. 
10.30 
10*30 
2-30 
2-35 
2*30 
9.12-9.20, dull. 
,, 
2*50 
2*45 
2.50 
9.20-11.04, bright sun 
P M. 
12.30 
16.85 
16*65 
12 30 
2*10 
2-20 
2.25 
11. 04-1 1. 10, dull. 
1 1. 10-12, bright sun. 
,, 
2*45 
2.30 
2*35 
1 2-12.05, dull. 
2.30 
16.90 
16.85 
2 30 
1.90 
2-10 
2.25 
12.05-2.20, bright sun. 
2*45 
2.30 
2*35 
2.20-2.25, dull. 
4*30 
16.90 
16.85 
4-30 
1.90 
i -75 
1.70 
2.25-6.10, bright sun. 
6.30 
16*95 
16.90 
»» 
2*35 
2.30 
2*35 
6.30 
2.05 
2*45 
2.50 
>» 
2.50 
2.50 
2-60 
Series 4. — ■ Two pinnae of leaf No. 1, 428*05 sq. cm. area. 
Tested on May 23. 
Hour of 
removal 
Acid required to 
from ap- 
paratus. 
neutralize 2 5-07 c.c. 
of BajOH\. 
A.M. 
Test. 
c.c. 
Control. 
c.c. 
7 * 5 ° 
i 6*35 
16*15 
9 * 5 ° 
1 7.10 
16.95 
11.50 
17.20 
17.10 
r. m. 
1.50 
17.0 
16.90 
3*50 
2 1.70 
21*50 
5 - 5 ° 
21*70 
21.60 
6.50 
22.45 
22.40 
Time Spread of lower edges 
measured, of adjacent pinnae. 
Weather conditions. 
5.50, sun out bright. 
3.25, cloudy and windy. 
4.0-5.17, bright sun. 
5-i 7-5*55, dull. 
5.55-6.09, bright sun. 
6.09, sun down. 
The pinnae had not yet spread. 
