ACCURACY is the goal of all work in bacteriology as well as in 

 chemistry. It is better served when all bacteriologists work 

 with uniform culture media, standardized to a high degree of 

 uniformity, as in the use of "Difco" Culture Media, Dehy- 

 drated. Uniformity of cultural factors is assured, either for 

 the same worker at different times, or for different workers 

 at the same time. 



SPEED is greatly desired in '.bacteriological procedure and no ad- 

 vance in this respect has been made for many years that com- 

 pares with the use of * 'Difco' ' Culture Media, Dehydrated. 

 The saving in time, as contrasted with the old methods, is 

 easily demonstrated, and the difference is incredible. 



CONVENIENCE becomes a prime consideration when accuracy and 

 speed are at stake. The convenience of "Difco" Culture 

 Media, Dehydrated, can*be appreciated only by actual trial. 

 Think of having [a !dozen different formulas in convenient 

 packages on your shelves, needing only one weighing and the 

 addition of water to obtain a medium ready to sterilize. 



ECONOMY is a consideration when quality has been satisfied. 

 The use of ["Difco" Culture Media, Dehydrated, assures 

 economy, not only thru the factors of Accuracy, Speed, and 

 Convenience, [but by actual comparison of costs, based on 

 materials, labor, and time. 



More than a dozen standard formulae, all carried in stock by 

 the principal dealers in scientific supplies. Descriptive Bul- 

 letins upon request. 



YOUR INQUIRIES ARE SOLICITED 



DIGESTIVE FERMENTS COMPANY 



DETROIT, MICHIGAN, U. S. A. 



