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The effect of sunlight on population has been studied by M. Lugeon in the Canton Valais, Switzerland, and a brief statement of his results is given in Science, June 6. He finds that in the principal valley of the canton, between Martigny and the Rhone glacier, there is a marked difference in the populousness of the two sides of the valley; that most exposed to the sun having decidedly the largest population, and this does not appear to altogther depend upon the physical conformation, but he is inclined to attribute it mostly to the different exposure to sunlight. With one or two exceptions all the villages are on the sunny side of the valley and the dwellers on that side form a sort of aristocracy, being more prosperous and better educated and look with some contempt on their poorer neighbors on the shady side. In one village there are actual
THE STIMULUS OF SUNLIGHT.. JAMA. 1902;XXXVIII(24):1581. doi:10.1001/jama.1902.02480240031007
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