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The Phosphatase Test—Extent of Use in North America^1,2,

Department of Dairy Technology, Ohio State University, Columbus, Ohio

ABSTRACT

In order to determine how universally the phosphatase test is being used in North America, 454 questionnaires were mailed out to individuals in official city, state, provincial, county, private, and milk plant laboratories. (List furnished through the courtesy of the American Public Health Association Committee on Standard Methods for the Examination of Dairy Products.)

A total of 281 questionnaires or 62.1 per cent of the number mailed were returned. Fifty-five laboratories reported that they were not using the test. Eighteen of these were no longer active or were not doing milk work. Of the other 37 laboratories not using the phosphatase test, 17 were official city laboratories (16 U. S., 1 Canada), 5 were State Laboratories (one of these reported it did not use the test routinely, but did not state the modification which was occasionally used), 9 were private laboratories, and 6 were plant laboratories.

It is interesting to note the rapidity with which the phosphatase test has been taken up by various laboratories charged with the responsibility of safeguarding the quality of milk supplies.

¹ Presented at the Fifth Session of the 70th Annual Meeting of the American Public Health Association, October 16, 1941

² A detailed tabulation of the data furnished by the various laboratories reporting the use of the phosphatase test is available in mimeographed form and may be had by writing to the author.