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In this edition every chapter has been enlarged, there are new illustrations and many new references appear, more than doubling the number of those in the first edition. There is an increase of nineteen pages in the chapter on the physiology of light and a total of fifty-two new pages. The volume covers the entire field of light therapy, including infra-red radiation. It quotes freely many authoritative statements, among which are those of the Council on Physical Therapy of the American Medical Association. The broad and painstaking work of that body, of which the author himself is a member, has done much to place light therapy on a sound basis during the past few years. In view of this fact the introductory sentence of the author's conclusions, "light therapy is still in a chaotic stage," retained from the first edition, does not appear quite warranted any more. The typography of
Light Therapy. JAMA. 1937;109(5):386. doi:10.1001/jama.1937.02780310064036
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