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To the Editor:
—It will be remembered that some ten years ago the Boulder Lodge Sanitarium followed up Finsen's work with sunlight and, particularly, demonstrated the great depths to which the chemical rays of light could be made to penetrate. Subsequently we used the light in the treatment of pulmonary tuberculosis In following Finsen's experiments some peculiar effects have been noted on the properties of sunlight to which attention has not yet been called.Direct sunlight falling on the nude body produces erythema solare, marked by extreme redness, swelling and great tenderness, with subsequent peeling of the skin. There is some tendency to the formation of blisters on the surface. Sunlight, concentrated by large reflecting mirrors and passed through blue glass, thus securing the maximum effect of the chemical rays, shows a very great tendency to blister the skin, but there is little redness and swelling and practically no pain. Focusing
Kime JW. Sunlight in Therapeutics. JAMA. 1912;LVIII(13):955–956. doi:10.1001/jama.1912.04260030353027
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