322 



BOTANICAL GAZETTE 



[NOVEMBER 



is a point of interest to know how generally this great power of 

 absorbing and storing nitrates is possessed by weeds. 



FlG. 2.— Ratio of nitrate nitrogen to total nitrogen; ratio for branches (not 

 shown in figure) 56 4. 



Amino N - The amino nitrogen was determined by the Van 

 Slyke apparatus. The amino acids thus determined are chiefly 



