This book is Part 1 of Volume 2 of a series of five volumes on dermatology and venereology. The following subjects are thoroughly discussed: physical therapy, including x-ray therapy with hard and soft rays; radium and electron therapy; the use of radioactive isotopes; treat ment with ultrasound, U. V. rays, heat, and electricity; baleneotherapy, and the effect of climate. Cosmetic dermatology is taken up in detail. Diseases of unknown origin are then discussed; among others are erythema multiforme, erythema nodosum, and numerous other erythemas, also erythematosquamous eruptions, such as psoriasis and parapsoriasis, and, in addition, the erythrodermas, dermatomyositis, lupus erythematosus, and periarteritis nodosum. The photographs are good, and the bibliography is adequate. The volume gives a thorough review of the subjects treated.