"DIFCO" STANDARDIZED 



PRODUCTS FOR CULTURE MEDIA 



T\ \ r"TO PTTPTOIVT? ^ ii^iti-ient for bacteria, derived from 

 iJi^Vj L\J'LLjL L \J L\ 1^ selected and analysed proteid material, 



processed under careful control, and rigidly standardized chemically and 



bacteriologically. 



■RATTn PTTT7 HIFT^TTTIV/I^ standard test medium for 

 DALlU-DlLli MriUlUiVl B.coli,contammgm add-on 

 to the necessary bile, 1% of Peptone and 1% of Lactose, all reduced to powder 

 form, ready for use upon dissolving in water and sterilizing. 



"D 4 /^XO P1?T AXTTVTT ^ product designed for the peculiar 

 i3r\\^ 1 vJ"VJl_iljrV 1 111 r!i needs of culture media, with low 



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



packaged in granules in air tight cartons. 



TX \ r^nrO a r^ a T? ^ selected Japanese agar, carefully treated to 

 -U.^ v>( X Vy"xWJr\A\. reduce pigment, extraneous matter, inorganic 



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



Kcadily dissolved without attention. 



PAr^T^O 1^171717 '^ desiccated lean beef meat, especially made for 

 -iJr\v>4 J. \J'1J±^Lj1. use in place of fresh beef, and eliminating its 



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



and extract. 



P A r^nrO \7T? at ^ desiccated lean veal, convenient, economical 

 -L''^V>< J. v7" V l_ix\.J-j and reliable forthe preparation of diphtheria toxin. 



RAr'XO T Ar'XO^l? "^ P"-"'^ ^"^ ^^^^^^^ powder, free from other 

 -Di^ v>( 1 W"l^r\.V>( 1 v/kJ X^ sugars, ashless, no traces of starch, pro- 

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

 for bacteriologists. 



"RAr^TTO OYr^AT T ^ ^^^^ ^^^^ powder, manufactured so as to 

 i3r\V4 1 \J'\J I\.\Ji\Lj±j 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. 



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., Sicifl^u^s.T: 



