W. A. Davis 



341 



B. 



Series III (Table III, Fig. 3). As in Series II, the ratio j is, with 



few exceptions (9 a.m., 11 p.m. and 5 a.m.), approximately unity when 

 the pentoses are taken as xylose ; in most cases the ratio is greater than 



Fig. 3. Apparent dextrose and laevulose, Mangold leaves. Series III, Oct. 11-12, 1912. 



1 when the pentoses are assumed to be xylose and less than 1 when 

 they are taken as arabinose. As in Series II it can be shown that when 



the ratio ^ most departs from unity (5 a.m., 7 a.m., 9 a.m.) the difference 



