THE CARBOHYDRATES OP THE ANGIOSPERM LEAF 27 



good by translocation upwards. .The, depletion never 

 amounted to more than two-thirds of the original quantity 

 of sugar present. The results of Dixon and Atkins (1910) 

 on the osmotic pressures of leaves kept in darkness for 

 many days are quite in accord with Parkin's sugar 

 analyses, as may be seen from their measurements sub- 

 joined: 



TABLE XVI. 



Syringa vvlgaris : LEAVES. 



Here translocation, and in the earlier stages the pro- 

 duction of maltose, made good the sugars lost by respira- 

 tion. The low values for the darkened leaves gathered on 

 September 30 may be explained as due to the failure of the 

 other leaves to supply their deficiencies, owing to conditions 

 unfavourable to photosynthesis having prevailed. Thus 



