W. A. Davis, A. .1. Daish axd G. C. Bawyek 299 



maxinuim about mid-day, exactly as in the leaves; after reaching the 

 maximum, the sugars (that is the hexoses, the saccharose being praclicallij 

 constant all day) fall off steadily, almost along a straight line. In the 

 top half of the stalks this falling off in the proportion of sugars continues 

 all the night through, but in the bottoms it continues only till mid- 

 night, when a slight rise in the proportion of the sugars occurs, owing 

 probably to the rate of inflow from above being greater than the outflow 

 into the roots (see Figs. 7 and 8). 



10a.m. 12noo[i2pm, 4 6 8 10 12Night2AM 4 6 8 

 Fig. 9. Sugars in aiaXks, Mangolds, Series II. Sept. iO-11, 1912. 



In the September picking (Series II) (Fig. 9) the saccharose is again 

 practically constant throughout the 24 hours, but the total hexose 

 increases from 10 a.m. to 4 p.m., corresponding with the increase of the 

 leaf sugars which occurs during this interval ; at 4 p.m. a falling off of 

 the hexoses occurs in the stalks, which lasts until nearly 11 p.m., and 

 this coincides with the increase of the cane sugar and hexoses in the 

 leaf which occurs at 4 p.m. (see Fig. 5), and was assumed to be due 

 probably to a cessation of translocation from the leaf. It is interesting 

 to note that the large increase in both saccharose and hexoses, which 

 occurs in the leaf between sunset and 2 a.m. (Fig. 5) and was assumed 



