Journal of bacteriology . actose or glucose agar than onthose with plain agar, as the opacity of the medium is very muchincreased in the presence of a fermentable carbohydrate, due tothe growth of acid-producing organisms. In fact, unclarifiedlactose agar gives, in our hands, nearly as clear a differentiationof bacterial types as does the special casein agar devised byAyers.^ These points are well illustrated by the followingphotographs. SUMMARY Data are presented which it is thought warrant the recommen-dation that agar containing glucose or lactose be adopted as thestandard medium for the ro
Journal of bacteriology . actose or glucose agar than onthose with plain agar, as the opacity of the medium is very muchincreased in the presence of a fermentable carbohydrate, due tothe growth of acid-producing organisms. In fact, unclarifiedlactose agar gives, in our hands, nearly as clear a differentiationof bacterial types as does the special casein agar devised byAyers.^ These points are well illustrated by the followingphotographs. SUMMARY Data are presented which it is thought warrant the recommen-dation that agar containing glucose or lactose be adopted as thestandard medium for the routine bacteriological analysis of milk. The advantages of a carbohydrate medium over plain agarmay be summed up in the following points: 1. A higher count is obtained. 2. The colonies grow larger and more rapidly which greatlyfacilitates the counting of plates. 3. It is of some value as a differential medium. * U. S. Bureau of Animal Industry, Report for 1911. JOURNAL OF BACTERIOLOGY VOL. I PLATE 1 Plain agar Lactose agar. Milk a. Dilution of 1/100 on plain and lactose agars. Incubated at 37°C. for forty-eight hours. Plain agar Lactose agar
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