"DIFCO" STANDARDIZED 



PRODUCTS FOR CULTURE MEDIA 



RArTO-PFPTONF ^'^^*^^^^* ^^^ bacteria, derived from 

 -L'^^ lvy-*AJ-il Ivyill^ selected and analysed proteid material, 



processed under careful control, and rigidly standardized chemically and 



bacteriologically . 



RArTO RTTF MFHTTTM^ standard test medium for 

 Url V>. 1 \J''IJ11jLj itll^ 1/1 U itl B. coli, containing in addition 

 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. 



RAr'XO PFT ATTIVT? ^ product designed for the peculiar 

 -D/Av. 1 VJ-VJlil^/Al 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 \ rTn.rj'p YTT? rmF ^ ^^^^' ^^^' ^^'^^ powder, free from 

 -L'-TI.V* 1 V>f"ly J 4J\ 1 1Vv/kJ1-/ other sugars, practically ashless and 



anhydrous, without traces of heavy metals, dextrins, or alcohol. Standard- 

 ized by chemical and biological tests. 



T^Ar^nrO A^^AT? ^ selected Japanese agar, carefully treated to 

 ■■-'^^^ -■- vy"i^VJr\lV reduce pigment, extraneous matter, inorganic 



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



Readily dissolved without attention. 



T^Ar^TTO T^FFF ^ desiccated lean beef meat, especially made for 

 •*-''^^ -■- vy"lll^l^l use in place of fresh beef, and eliminating its 



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



and extract. 



R A r^nPO A7F AT "^ desiccated lean veal, convenient, economical 

 -^-^^ 1 v/" T l^r\.l^ and reliable for the preparation of diphtheria toxin. 



T^Af^nrO T Ar^nrOQT? ^ P^^^ ^^^ wWte powder, free from other 

 -■-'^^~*-^ -■- Vy"ljrA.V>* 1 V/kJli sugars, ashless, no traces of starch, pro- 

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

 for bacteriologists. 



W A r^nrO O Vr^ a T T ^ ^^^ ^^^® powder, manufactured so as to 

 -*^^^^^ •■- v/"Vy yVvJi^ljl^ 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. 



A New Line of DEHYDRATED CULTURE MEDIA, of Standard Formulae, now ready 

 Requests for Samples and Literature Promptly Answered 



Digestive Ferments Co., BiS!\?i.T: 



THE WAVERLY PRESS 



BALTIMORE. U. 9. A. 



