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1Research Laboratories of the Dairy Division, United States Department of Agriculture
1
Published by permission of the Secretary of Agriculture.
The writer wishes to acknowledge his indebtedness to his colleagues, particularly to Dr. William M. Clark for assistance and for many suggestions.
Since this paper was written, the writer has had the privilege of reading two manuscripts by Winslow and Cohen. They cover much the same ground as this paper and the results and conclusions drawn are substantially in accord with those given here.