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July 6, 1907


JAMA. 1907;XLIX(1):45-46. doi:10.1001/jama.1907.02530010049006

As we enter on the season when the amount of light to which people are exposed is much increased, and in which it is usually thought that health is better because of the influence of sunlight, certain recent observations and investigations with regard to the physiologic action of light on living things are worthy of note. Major Charles E. Woodruff, Surgeon U. S. A., who has devoted much attention to the subject of the effects of light on animal tissues and metabolism, has reviewed the recent contributions to this subject in American Medicine for April, 1907. Major Woodruff states that the young rats which he raised in the full glare of sunlight were stunted to a remarkable degree, though all other conditions of their environment were extremely favorable for nutrition and growth. He seems, however, to have overlooked the fact that rats do not naturally live in the sunlight and

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