THE RELATION BETWEEN DARK ADAPTATION AND THE LEVEL OF VITAMIN A IN THE BLOOD

^{Research Service, First Medical Division, Welfare Hospital, Department of Hospitals, New York City}

^{Department of Medicine, College of Physicians and Surgeons, Columbia University, New York City}

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^{Research Service, First Medical Division, Welfare Hospital, Department of Hospitals, New York City}

^{Department of Medicine, College of Physicians and Surgeons, Columbia University, New York City}

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