I90i 



HASSELBRING— ASSIMILATION OF PENIC1LLIUM 



183 



Esters 0} alcohol with mineral acids. — The cultures with esters of 

 alcohol with mineral acids gave the results expressed in the following 

 tables. The actual quantity as well as the concentration of the 

 organic substances in each flask are given in tables V and VII in the 

 horizontal lines, and in tables VI and VIII at the head of the columns 

 giving the yields for each set. 



TABLE V 



TABLE VI 



* Contaminated. 



* The concentration of the ethyl nitrate is not stated, since only a part of the amounts given goes 

 into solution in 50" of the culture fluid. 



TABLE VIII 



The cultures of potassium ethyl sulfate (table V) had a barely 

 visible film on the surface, similar to cultures to which no organic 

 matter had been added. Microscopic examination showed that prac- 



