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The development of plant and animal life under the influence of sunlight, together with the clinical results of its use as a therapeutic agent during the last twenty years, and its effect as a prophylactic agent are advantages which contribute to a stronger race, relief from suffering and the prevention of disease, in direct proportion to the accuracy with which fundamental facts are learned and applied in each instance.
Until experimental and clinical evidence is available to indicate that some departure from the application of sunlight is more beneficial in the treatment of chronic diseases, it would seem most rational to use sunlight, under the influence of which man has developed, and on which the continuance of all life is dependent. In many localities sunlight can be used for only three months of the year, during which time it may not be usable because of local conditions. To wait four
SCHWARTZ RP. CARBON ARC RADIATION: DESCRIPTION OF A NEW HIGH-INTENSITY ARC. JAMA. 1927;88(9):632–634. doi:10.1001/jama.1927.02680350016007
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