il m 



"DIFCO" STANDARDIZED 



PRODUCTS FOR CULTURE MEDIA 



RAr'TO PFPTOIVF ^ nutrunt for bacteria, derived from 

 ■*^-^^ A Vy *X XjA a V/li Lj selected and analysed proteid material, 



processed under careful control, and rigidly standardized chemically and 



bacteriologically . 



"R A CTCi RTT V MFT^TTTM ^ standard test medium for 

 Dl\\j lyJ'DlljLj lTl£iUHJiyi 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. 



RAPTO PTTT ATT1VT7 ^ product designed for the peculiar 

 I^A\^ 1 W-Vjrilji\l lillL needs of culture media, with low 



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



packaged in granules in air tight cartons. 



1) 4 /^nPO A r^ A 1? ^ selected Japanese agar, carefully treated to 

 AJ-^^V^ A w"xA.VJxA.XV reduce pigment, extraneous matter, inorganic 



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



Readily dissolved without attention. 



T) 4 {^^C\ T^TTTTTr ^ desiccated lean beef meat, especially made for 

 -L'^~*-V-^ A yJ^MJM-j±jL use in place of fresh beef, and eliminating its 



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



and extract. 



Tl 4 /^np/^ A7T? AT ^ desiccated lean veal, convenient, economical 

 -■-'■^V>< A v/" T A^rxA^ and reliable for the preparation of diphtheria toxin. 



PAf^T^O T Af^nPO^T? ^ ^^^^ ^^ white powder, free from other 

 AlrW* A w"A^rWj A vy OAj sugars, ashless, no traces of starch, pro- 

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

 for bacteriologists. 



PAr^nrOOYr^ATT ^ ^^^ ^^^^ powder, manufactured so as to 

 -Llr\.V-« A Vy"v/i\.VJrxAjAj 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 reliabiUty. 



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., SicI!\?J.T: 



THE WAVERLY PRESS 

 BALTIMORK, U. 8. A. 



