
1905.] 
On the Physiological Processes of Green Leaves. 
105 
Table [X.—The Summarized Results of Table VIII, showing the Mode of 
disposal by the Leaf of the Energy flowing into it. 
The Total Energy received = 100. 















Expt. | Expt. | Expt. | Expt. | Expt. | Expt. | Expt... 
I. 108 EEE LV. Ve VI Wit. 
w. Energy used for photosynthesis 0-42 1-59 66>). 1-32 0:49) 1°34 | 2sié 
W. 5 transpiration... 9°67 | 53°60 57°01 35°64 | 52°72 15°64 16°42 
W+w. ‘Total energy expended! 10°09 | 55°19 | 58°67 | 36°96 | 53°21) 16°98| 17°58 
in internal work | 
R—Ra. Solar radiant energy lost| 35°31 | 35°30 | 35°32 35°28 | 35°30 30°00; 30°00 
by transmission through leaf | | | 
7. Energy lost by re-radiation| 54°60 9°51 601 | 27°76 | 11°49, 58°02 | 52°42 
and air-convection | | 
100-00 | 100°00 100-00 100-00 | 100-00 100-00 | 100-00 
Expt. | Expt. Expt. | Expt. | Expt. | Expt. 
Vili’ | IX. X. Mele | ene) EEN, 
| 
w. Energy used for photosynthesis, 0°78 1°16 128), 1:14 | 0°66 0°27 
W. i transpiration.... 10°21 18°47 | 60°03 35°60 | 48°39 53 °30 
W+w. ‘Total energy expended| 10°99 19°63) 61°31 36°74] 49°05 | 58°57 
in internal work 
R—Ra. Solar radiant energy lost| 30°03 | 27°20) 27°24 27°20 | 31°40 | 31°40 
by transmission through leaf | | 
v. Energy lost by re-radiation| 58°98 | 53°17 11°45 | 36°06 | 19°55 | 15°03 
and air-convection | 
100 °00 | 100-00 ; 100°00 | 100°00 | 100-00 






100 ‘00 


far exceeded the reception and absorptionlof solar energy, that the tempera- 
ture of the leaf was lower than the surrounding air; 
in other words, the leaf 
was receiving energy from its surroundings in addition to that of the solar 
radiation incident upon it. 
Owing to the desirability in these last-mentioned experiments of employing 
solar radiation of considerable intensity, direct control-experiments on assimi- 
lation could not be carried out simultaneously as they were in the previous 
experiments of Tables VIII and IX, where the insolation had been purposely 
lowered in intensity by suitable screening. 
A close estimate of the rate of assimilation could, however, be arrived at 
from previous experiments, and the error introduced into the thermal results 
by this cause must be very small. 


