BACTO-PEPTONE 



FORMULA NOT ALTERED 

 SINCE 1914 



MEETS EVERY DEMAND FOR A STANDARD PEPTONE 



BACTO-PEPTONE, the original peptone designed to 

 meet particularly the varied nutritional requirements of 

 bacteria in culture, is the first peptone on record having 

 a definite requirement as to the H-ion concentration in 

 solution. 



BACTO-PEPTONE, correct in its chemical and biolog- 

 ical properties, meets the varied requirements of a pep- 

 tone for routine bacteriological work, the world over. 



BACTO-PEPTONE is standardized so as to support 

 vigorous INDOL production within 24 hours after 

 inoculation. 



CARRIED IN stock by th» PRINCIPAL DEALERS In SeUntlHe Suppllu 



Specify "DIFCO" 



The TRADE NAME of the PIONEERS 



In the 



RESEARCH and PRODUCTION of DEHYDRATED CULTURE 



MEDIA and RARE SUGARS 



DIGESTIVE FERMENTS COMPANY 



DETROIT, MICHIGAN, U. S. A. 



