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Based on a report presented at the Seminar of the Department of Public Health of the Yale School of Medicine by the senior author, a Sterling Fellow of Yale University. The authors wish to express to Dr. Arnold Klebs, Dr. C.-E. A. Winslow and Dr. John F. Fulton their gratitude for the many valuable suggestions and criticisms which they have made during the preparation of this paper.
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Leona Baumgartner, New Haven, Conn.
Elizabeth Mapelsden Ramsey, New Haven, Conn.



