244 



Latham : Assimilation of Sterigmatocvstis 



The conclusions, summarized, are given below : 



1. The work of Puriewitsch and others who found fixation of 

 free nitrogen by Stertgmatocystis riigra [Aspergilhis niger) is 

 confirmed, 



2. The fixation of free nitrogen is lessened and finally inhibited 

 by the presence of xinc sulphate in minute quantities, 



3. The relative amount of nitrogen entering into the substance 

 of the fungal felt remains the same for stimulated and unstimulated 

 cultures, the differences of behavior toward nitrogen appearing in 

 the fluid substratum. 



Botanical Laboratories, Barnard College, 

 Columbia University. 



■ 



FEBRUARY, 1909. 



