BOOK REVIEWS 83 the author disclaims any pretense of comprehensivehess, one might have wished a more exhaustive treatment of the biological effects of ultra- violet radiation, and particularly of its dermal action in its several as- pects (pigmentati'on, histopathology, allergy, etc.). Because of his back- ground, the author's primary inter- est appears to be in the physical an4 technicological fields, hence the somewhat sketchy treatment of the biological effects involved. However, the particular value of the treatise depends precisely upon the wealth of information it pro- vides in regard to the construction and performance of the different artificial sources of ultraviolet radi- ation, and to this extent the book fills a real need.--E. G. Lehn & Fink Prod. Corp.

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