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Author notes

1Presented at the 43rd Annual Meeting of the International Association of Milk and Food Sanitarians, Inc. at Seattle, Washington, September 5–7, 1956.

Dr. Samuel H. Hopper received the Ph.D. degree in Bacteriology from the Massachusetts Institute of Technology in 1937. He has served on the academic staffs of the Georgia Technological Institute, the University of North Carolina, and presently is Chairman of the Department of Health, Indiana University. Dr. Hopper is a Fellow of the APHA and of the AAAS, and is a consultant to the Indiana State Board of Health.

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