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In a series of volumes of which this is the second, Dr. Petersen has undertaken to consider the highly difficult but important question of the influence of the weather on diseases. The question is difficult because one is dealing with imponderable factors which are extremely hard to evaluate. It is important because a large number of facts indicate that atmospheric conditions have effects on the healthy as well as on the diseased body. It is fortunate that Dr. Petersen has undertaken this investigation, for there is need for scientific consideration of the subject. He has brought to it a critical, trained, scientific mind, and even with these qualities he suggests much that is indefinite on the subject. To the dermatologist the special interest lies in the vascular disturbances of the skin which are considered from this standpoint. The two chapters given to this subject are extremely interesting