BACTOPEPTONE 



has stood the test of six years of use in 

 laboratories all over the world. 



DEHYDRATED CULTURE MEDIA 



are a signal advance in the science and art 

 of bacteriology. 



RARE SUGARS "DIFCO" 



are of the highest standard of purity, espe- 

 cially suitable for bacteriological work. 



OTHER FINE CHEMICALS 



are gradually being added to our line, 

 such as 



Acid Potassium Phthalate, Decolorizing 

 Carbon, Tyrosine, Invertase. 



Send for descriptive bulletins and price list. "DIFCO" products 

 are carried in stock by the principal dealers in Scientific Supplies. 



Digestive Ferments Company 



Detroit, Michigan, U. S. A. 



