I9I9] 



woo— A MA RA NTH US 



323 



of the mono-amino-monocarboxylic acids. In each estimation 

 only 2 cc. of the solution was used. The amino acid nitrogen deter- 



FiG. 3. — Nitrogen compounds in roots 



mined throughout the season is given in table II. Curves showing 

 the variation in roots, stems, and leaves are given in figs. 3, 4, and 5 

 respectively. In all the three organs the variation is very small. 



