W. A. Davis and G. C. Saayyer 



567 



Discussion of Eesults. 



A. The Relation between the Sugars and Starch of the Leaf. 



As in the mangold leaf during the early stages of growth, saccharose 

 is the predominating sugar in the potato leaf — the curve of sac- 



Fig. 1. Potato leaves, July 16-17, 1914. 



charose in Fig. 1 is well above the curve of hexoses and is distinguished 



from it by its regularity. From 6 a.m. to 2 p.m. as the temperature 



Journ. of Agric. Sci. vn 25 



