Our thanks are due to the Connecticut Agricultural Experiment Station, the Journal of Biological Chemistry, Professor E. V. Mc Collum, Professor J. F. Mcclendon, Dr. A. D. Emmett and associates, Professor H. Steenbock and associates for permission to use illustra tions and charts relating to investigations on vitamins, and to Mr. B. Dass for various suggestions and for assistance in the reading of proof.

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