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³ John and Mary R. Markle Scholar.

⁴ A. H. Robins Research Fellow in Gastroenterology.

¹ This investigation was supported by research grants from the National Institute of Arthritis and Metabolic Diseases of the National Institutes of Health, U. S. Public Health Service （A-173）; the John and Mary R. Markle Foundation; the A. H. Robins Company, Richmond, Va.; and funds for Research in Biology and Medicine accruing through Initiative 171 of the State of Washington.

² Presented in part before the annual meeting of the Western Society for Clinical Research, January 29, 1954.