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The number of books dealing with the various forms of radiant energy and their application to medicine is increasing rapidly. One of the first books in this field which has proved so productive of literary activity was that of General Pleasanton on "The Influence of the Blue Ray of the Sunlight and of the Blue Color of the Sky in Developing Animal and Vegetable Life in Arresting Disease and in Restoring Health in Acute and Chronic Disorders to Human and Domestic Animals," published in Philadelphia, 1877. The general's book was printed with blue ink and bound in blue. This led Finsen to suggest that "its contents could hardly fail to be colored also," a remark not without reason in view of General Pleasanton's tendency to regard blue light as a panacea. Of the three books at present noticed, the first may be dismissed with the statement that it was deemed
The Action of Light as a Therapeutic Agent. By Leonard K. Hirshberg, Baltimore, Md. Fiske Fund Prize Dissertation. Cloth. Pp. 49. Providence: Snow & Farnham. 1904. Roentgen-Ray Diagnosis and Therapy. By Carl Beck, M.D., Professor of Surgery in the New York Postgraduate Medical School and Hospital. With 322 illustrations In the text. Cloth. Pp. 460. Price, $4.00. New York and London: D. Appleton & Co. 1904. Light Energy; Its Physics, Physiological Action and Therapeutic Applications. JAMA. 1905;XLIV(2):144. doi:10.1001/jama.1905.02500290064024
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