4 o 
Journal of Agricultural Research 
Vol. XXVI, No. I 
Table IX .—Temperature changes of the air and of the leaves of turgid and wilted cowpea 
plants in direct sunlight and in diffuse light caused by a heavy cloud obscuring the sun 1 
IN DIRECT SUNLIGHT 
Temperature of - 
Air. 
Turgid leaf. 
Wilted leaf. 
°C. 
0 C. 
0 C. 
34 * 2 
33-0 
37 - 7 
33 -o 
32 . 4 
37 -0 
34 - 2 
33-0 
39 - 7 
33 - 0 
31. 2 
35-8 
31.8 
32. 0 
35 -° 
33 - 8 
32. 8 
37 - 2 
32.9 
31. 6 
35-8 
32 . I 
3 1 - 6 
34 - S 
33 - 5 
34 * 6 
37 - 2 
33 -o 
33 -o 
37 - 1 
34-0 
33 - S 
37 -o 
34-0 
33 -o 
38.0 
IN DIFFUSE LIGHT. CLOUD OVER SUN 
32.7 
31.0 
35 - 7 
3 i -9 
29.7 
33*5 
29. 0 
28. 6 
3 1 - 2 
29.7 
28. 2 
30. 2 
28.8 
28. 1 
29.7 
28. 7 
27.9 
2 9 * 5 
27. 8 
27. 2 
28. 7 
28. 0 
2 7 - 5 
29. 0 
1 The observations here tabulated were made between 9.55 and 10.10 a. m. 
Table X. —Temperatures of the air and of two leaves of a cowpea plant , one leaf in 
direct junlight'and the other shaded by the leaves of the plant 
Time. 
Temperature of- 
Air. 
Shaded leaf. 
Leaf in direct 
rays of sun. 
July 24; p.im. 
°C. 
°C. 
°C. 
2.00. 
3 6 -4 
32.9 
36. 1 
2.01. 
35-4 
31-9 
34 - 8 
2.02. 
35-4 
32. 2 
34.9 
2. 03. 
35-4 
3 i -9 
34*9 
2.04. 
35-6 
31.8 
33-9 
2-05. 
35-5 
32.2 
33*9 
2.06. 
34-5 
31.8 
34-4 
2.07. 
36.1 
32.9 
35-4 
2.08. 
35-4 
33 -o 
35-6 
2.O9. 
36-4 
32.9 
3 6 -4 
2.10. 
35 - 0 
32.4 
33-4 
2 .II. 
34-4 
3 i -4 
34 - 7 
2.12. 
34-7 
3 i -9 
35-4 
2.13 . 
34-4 
32.4 
35-6 
2.14 . 
34.9 
3 i -9 
34*4 
215 . 
35-2 
32. 2 
34-4 
2.l6. 
36. 1 
32.8 
34-9 
2.17. 
36. 6 
33-4 
35-9 
2.l8. 
35-9 
32-9 
36.0 
2.19. 
34 - 8 
32. 6 
34-9 
