. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BACTEEIOLOGICAL STUDY OP EETAIL ICE CREAM. 7 furnish evidence that ice cream can be made commercially, at least under some conditions, with a low bacterial content. If these aver- age counts are compared with the average counts from other cities, as shown in Table 1, it will be seen that, so far as bacteria are con- cerned, the quality of the ice cream is about the same in different localities. THE GROUPS OF BACTERIA. THE GENERAL GROUPS. The bacteria in 71 summer samples and 28 winter samples of ice cream were divided
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. BACTEEIOLOGICAL STUDY OP EETAIL ICE CREAM. 7 furnish evidence that ice cream can be made commercially, at least under some conditions, with a low bacterial content. If these aver- age counts are compared with the average counts from other cities, as shown in Table 1, it will be seen that, so far as bacteria are con- cerned, the quality of the ice cream is about the same in different localities. THE GROUPS OF BACTERIA. THE GENERAL GROUPS. The bacteria in 71 summer samples and 28 winter samples of ice cream were divided into groups by the milk-tube method of differen- tiation heretofore mentioned. With this method it was possible,. AS6% Fig. 2.—Average bacterial groups found in one cubic centimeter of ice cream during the summer months, showing percentages of groups. Group. Bacteria per c. c. Acid-coagulating 18,8G1,805 Acid-forming 7,844,575 Inert 5,292,815 Alkali-forming 704,195 Peptonizing 5,150,519 Total 37,859,909 on the basis of the 14-day reaction in litmus milk, to divide the bacteria into five groups, namely, acid-coagulating, acid-forming, inert, alkali-forming, and peptonizing. For convenience in obtaining a view of the average groups in an average samplo of ico cream, the result , arc presented graphically. Figure 2 represents 1 c. c. of ice cream and is divided into five sectors, each representing the avcrago percentage of a group of bacteria; The averages are based on the ilyses of 71 samples of ice cream examined during the summer on. It may be seen from the figure that the bacteria of 1 c. c. of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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