^ 



I 



" DIFCO " STANDARDIZED , 



PRODUCTS FOR CULTURE MEDIA 



RAr'TO PFPTOIVT? ^ nutrient for bacteria, derived from 

 -^-^^^ A Vy"A Lj 1. L v/ll J_i selected and analysed proteid material, 



processed under careful control, and rigidly standardized chemically and 



bacteriologically. 



T) A f^T^O O V^ ATT •^ ^^^^ ^^^^ powder, manufactured so as to 

 -■^-^"^^ A yj^yj l\^\Jr\.l^l^ preserve the essential properties of fluid 

 bile, and proved against known strains. Widely employed in the presumptive 

 test for B. coli, on account of its convenience and reliability. 



RAr'TO CVJ ATT1VIT7 ^ product designed for the pecuhar 

 Drl'L. 1 VJ-VjriJLrll liiri needs of culture media, with low 



moisture content, ready solubility, proper melting point, low acidity, and 



packaged in granules in air tight cartons. 



"D A /^np/^ A f^ A 1? ^ selected Japanese agar, carefully treated to 

 -^-^^^ A \y"'irA.\Ji:A.XV reduce pigment, extraneous matter, inorganic 



salts, and moisture. Packaged in spongy granular foiin in tight cartons. 



I'eadily dissolved without attention. 



PAr^nrO T^T?T?T? ^ desiccated lean beef meat, especially made for 

 J-*^^^ A XJ'IjLjI^L use in place of fresh beef,- and eliminating its 



inconvenience and variability. Always on the shelf, easy to handle, weigh, 



and extract. 



T> A /^T^/^ \7T7 AT ^ desiccated lean veal, convenient, economical 

 -^■^^^ -^ ^" ^ J_ii~i.Xj and reliable forthe preparation of diphtheria toxin. 



TlAr'TO T Ar'TO^F ^ '^"^^ ^"° ^^^^^^ powder, free from other 

 -L'^^^ A Vy"JL/i~xV>( J. V/kJl^ sugars, ashless, no traces of starch, pro- 

 teid, alcohol, or heavy metals, and completely soluble. A dependable product 

 for bacteriologists. 



Our Research Laboratories are Constantly Working on the Problems of 



Proteid Chemistry, Biochemistry, and the Metabolism 



of Micro-organisms 



Requests for Samples and Literature Promptly Answered 



Digestive Ferments Co., mci[!\?J.T: 



