﻿iqi6] A PPLEMA X — RES T PERIOD 275 



TABLE IV 















December 20 



February 13 





1.48 



3-84 



l. 76 





Oxidase. — The juice from new potatoes shows less ability to 

 accelerate the oxidation of pyrogallol than the juice from tubers at 

 the end of the rest period. The juice from the seed half causes no 

 greater acceleration of this oxidation than that from the stem half, 

 even after sprouting (tables VI-VIII). 



Nitrogen. — A general survey of the different combinations of 

 nitrogen in the tuber was made at intervals during the rest period 

 in order to determine if protein hydrolysis or other transformations 

 of the nitrogen-containing substances occur during the rest period 

 as necessary antecedents to sprouting. The following determina- 

 tions were made: total nitrogen, water-soluble nitrogen, nitrogen 

 coagulated by heat, nitrogen precipitated by tannic and by phos- 

 photungstic acids. It was assumed that the nitrogen coagulated 

 by heat represented the protein nitrogen, and the difference between 



