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. 



For more specific information send for BULLETIN 20 



CARRIED IN stock by the PRINCIPAL DEALERS in Scientific Supplies 



Specify "DIFCO" 



The TRADE NAME of the PIONEERS 



In the 



RESEARCH and DEVELOPMENT of BACTO-PEPTONE and 



DEHYDRATED CULTURE MEDIA 



DIGESTIVE FERMENTS COMPANY 



DETROIT, MICHIGAN, U. S. A. 



