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In a book of 205 pages on the general subject of light therapy it would not be possible to discuss the treatment of diseases of the skin at great length. From this standpoint the book by Krusen is of comparatively little value to the dermatologist. Its value lies in the space devoted to the physics and physiology of light therapy in general and to the various types of apparatus and the technic of using them. In the second edition the chapter on "Physiology" has been enlarged, and new illustrations have been added.
In the discussion on the source of light used in therapeutics adequate space is devoted to sunlight and to quartz mercury vapor arc, carbon arc and quartz mercury vapor glow lamps. Other less important and little known apparatus for light therapy receive less attention.
In the concluding chapter the author freely admits the shortcomings of light therapy. He
Light Therapy. Arch Derm Syphilol. 1937;36(1):245. doi:10.1001/archderm.1937.01480010249029
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