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Further Remarks on Data on Bacterial Counts Presented by Brew and Dotterrer and Analyzed by Brew^*

New York State Department of Health, Albany

ABSTRACT

Bacterial counts are commonly used by health departments in discriminating against sources of supply of milk for fluid use. It is usual in routine work to use some method of estimating the gross number of bacteria in milk. The number of bacteria, in the same lots of milk, estimated by various methods often varies considerably. Thus it may become of interest to compare the estimates of the number of bacteria in the same lots of milk by two or more different methods.

A comparison of the estimates of the bacteria in raw milk by means of the agar plate method and the direct microscopic method has been made by Brew (1) on the basis of data presented by Brew and Dotterrer (2). It is the purpose of this paper to present a few statistical considerations that were overlooked in the statistical analysis of the data but which serve to strengthen the remarks of Dr. Brew made in the text of his paper and to make a few additional remarks.

^* Acknowledgments are made to Dr. J. D. Brew, Milk Specialist, New York State Department of Health and to Mr. W. D. Tiedeman, Chief of the Bureau of Milk Sanitation, New York State Department of Health for advice in this presentation.