10 



H. J. Sears 



. 



i 



g 70 



1-4 



" 69 



B. proteus -vulgaris 



/ 



/ 



r 



«i ^ — ^ / 



B.pyocijaoQJS 



3 ^ <x 9 7 e 



AK or CULTUHI III DtY8 



/© /o 



Chart 1. Production of amino-acid and ammonia by bacteria in a 2% peptone solution 

 = ammonia nitrogen; = amino-acid nitrogen. 



