m 



"DIFCO" STANDARDIZED 



PRODUCTS FOR CULTURE MEDIA 



RAr'TO PFPTOIVF ^ nutrient for bacteria, derived from 

 iJ^^y^ 1. Vy-*A HjL L \J Lj ±j selected and analysed proteid mat-enai, 



processed under careful control, and rigidly standardized chemically and 



bacteriologi cal ly . 



"R A CTCi RTT V MFFITTTM ^ standard test medium for 

 -D^ v." 1 V/-D1 J^I-i iViri JJl U iVl 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'TO PFT ATTIVT? ^ product designed for the peculiar 

 -Di\\^ 1 lJ"Vj£il_i/\l 111 Ju needs of culture media, with low 



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



packaged in granules in air tight cartons. 



R A r'TO "HF l^TT? OSIF ^ ^^^^' ^"^' ^^^*® powder, free from 

 J-''^^ A yj'iy 1 JlS. L l\.\Ji3±J other sugars, practically ashless and 



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

 ized by chemical and biological tests. 



R A r^nPO A r^ A T? "^ selected Japanese agar, carefully trt^ated to 

 -L'-^T^V* X w"rxVJrA.rV reduce pigment, extraneous matter, inorganic 



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



Readily dissolved without attention. 



R A r^nrO RTTTTT? ^ desiccated lean beef meat, especially made for 

 "-^^ -■- Vy ■ JJ 1_/ J-/ 1. use in place of fresh beef, and eliminating its 



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



and extract. 



R A f^T^C\ \ITi AT ^ desiccated lean veal, convenient, economical 

 -■-'■^*-^ -■- Vy" T Lj£\Lj and reliable for the preparation of diphtheria toxin. 



R A f^nrO T A r^TOQT? a pure Snewhite powder, free from other 

 "■^~*-^ A V7"J_vx\.V4 A V/kJJ^ sugars, ashless, no traces of starch, pro- 

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

 for bacteriologists. 



R A r^TO O V^ ATT "^ ^^y ^^^^ powder, manufactured so as to 

 -"J-^vj 1 yj'KJ J\\J£\LjLj preserve the essential properties of fhiid 

 bile, and proved against known strains. Widely emploj'^ed in the presumptive 

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



A New L ne of DEHYDRATED CULTURE MEDIA, of Standard Formulae, now ready 

 Requests for Samples and Literature Promptly Answered 



Digestive Ferments Co., SiS!\?J.I: 



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THE WAVERLY PRESS 



BALTIMORE. U. a. A. 



