

1905.] 
On the Physiological Processes of Green Leaves. 
107 
Leaves and their Surroundings, the Incident Solar Radiation being Graduated 
Definite Amount of the Incident Radiation. 
Estimated temperature of leaf. 
Excess of partial pressure of water- 

vapour in leaf over that of air in 
CO, per square decimetre per hour. 
millimetres of mercury. 
— Assimilation in cubic centimetres of 

Transpiration in grammes of water 
per square decimetre per hour. 
Loss or gain of energy by the leaf in calories per square 
centimetre of leaf-lamina per minute. 

on leaf. 





13°97 *4-00° 


1 (10) | (11) 2) | (18) | (14) 
21:0) 8°65 *3-80/ 3-326 A5AT 
|20°3| 7-87 *3-80/2-580 | 0-2273 
21-0] 9°33 *4-00/ 3-476 | 0-4798 
20-°7| 8-99 *4-00 2-740 | 0:2399 
26°8| 14°66 *4:-00/4°178 | 0°5492 
25°38) 12-44 *4-00/3-715 | 02746 
21°4| 9°82 *4-00 3-661 | 0°3931 
21-2) 9-09 *4-00/3-270 | 02948 
|24°6| 10°68 *4-00) 4:206 | 0-4993 
|23°8| 9-60 *4:00/4-014 | 0°3744 
26°0| 12°69 | *4:00 15-780 | 0°5504 
25 °9| 12°54 | *4-00/5-438 | 0-4806 
27°0| 14°44 *4-00/4:277 | 0°5337 
26 °7 4.040 | 0:4666 

oS 
Coefficient of absorp- 
686 
686 
686 
686 
686 
686 
686 
686 
686 
686 
686 
686 

Solar radiation ab- 
sorbed by leaf. 
<= Ra: 
a 
ee 
in 
Energy expended 
assimilation. 
Ww, 
o~ 
— 
= 
—_ 
0 ‘0031 
00081 

0 :0033 | 
| 0 '2704. 
0 0033 



W. Energy expended in 
transpiration. 
“o™ 
ji 
QO 
er 
0 *3282 
| 0°2548 
0 3431 

Total energy used 
for internal work. 
W i+w. 
0 3464 
0 °2735 


Energy lost by re-radia- 
tion and air-convection. 
rie 
= 
bo 
o 
= 

Energy re- 
ceived from surroundings. 
(W + w)—Ra. 
0 0862 
0 -1090 

