Abstract
WITH further reference to our letter under this title in NATURE of March 7, p. 402, we have been in touch with Dr. E. M. Nelson, chief of the Vitamin Division, United States Department of Agriculture, Food and Drug Administration, Washington, concerning the ambiguous position of the U.S. Pharmacop” ia Reference Cod Liver Oil. Our query was, Are we sure that the ” Reference Oil” now in use is identical with the original product? In reply to our question he has given us permission to publish the following facts, which undoubtedly throw some light on a rather difficult situation:
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WARD, J., HAINES, R. Estimation of Vitamin A. Nature 138, 128 (1936). https://doi.org/10.1038/138128a0
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DOI: https://doi.org/10.1038/138128a0
