THE CARBOHYDRATES OF THE ANGIOSPERM LEAF 25 



TABLE XIV. 



SUGARS IN SNOWDROP LEAVES, AS PERCENTAGES OF DRY WEIGHT. 



Here the hexose is again practically constant, while the 

 sucrose has diminished by nearly 5 grammes in the attached 

 leaf, and by 2 grammes in the detached. Thus 3 grammes 

 has certainly been lost by translocation, leaving 2 grammes 

 to be accounted for by respiration and diffusion from the 

 cut ends of the petioles. 



(d) April 5, Carlisle: Maximum shade temperature, 

 58 F.; sunny morning and dull afternoon. Insolation 

 after cutting of leaves, from 9.30 a.m. to 4.30 p.m. 



TABLE XV. 



Sucrose 

 Hexose 



Total sugar 



Attached Leaves. 

 14-65 

 11-66 



26-31 



Detached Leaves. 

 20-42 

 10-50 



30-92 



In this series the plucked leaves were insolated while 

 standing in dishes containing water placed beside the 

 control plants. The leaves were spaced so as to permit of 

 good illumination, and were maintained in an upright posi- 

 tion. The object of the experiment was to ascertain to what 

 extent sugar accumulated in the leaf when translocation 

 was prevented, and to see which sugar was most affected. 



