BACTO -PEPTONE 



DIFCO STANDARDIZED 



The Original Standardized Peptone 

 for Bacteriology 



Bacto-Peptone is the original peptone designed to meet particularly 

 the nutritional requirements of bacteria in culture. 



It is the first peptone designed to meet the requirement of uniformity 

 in its chemical and biological properties. 



It is made in large quantities by expert workmen under rigid scien- 

 tific check and control. Raw materials are approved only after assay. 



Accurate records of each lot are kept throughout the manufacturing 

 process, and only those lots which pass definite chemical and bac- 

 teriological tests are allowed to go into stock for distribution. 



A definite requirement as to the H-ion concentration in solution 

 was applied first to Bacto-Peptone. 



It is standardized as to its Tryptophane content and supports vigorous 

 Indol production within 24 hours after inoculation. 



Bacto-Peptone has passed the experimental stage and has proved 

 its absolute dependability for all nutritional requirements of Bac- 

 teriology. 



Bacto-Peptone stands on its own merits and completely substantiates 

 all claims made for it. 



The additional equipment which we were forced to install in order 

 to furnish the unprecedented quantities of Bacto-Peptone requisi- 

 tioned for the U. S. and allied military establishments enables us 

 to take care of all orders, irrespective of size, promptly and uniformly. 



Carried in stock by the Principal Dealers in Scientific Supplies 



DIGESTIVE FERMENTS COMPANY 



DETROIT, MICH., U. S. A. 



