This is devoted to a discussion of nontuberculous diseases of the respiratory tract. A historical sketch of the treatment by hydrotherapy and climate begins with ancient times and carries through each period to the present. One chapter is devoted to the general action of mineral waters and various climates, which includes a map to show where in France various mineral waters are to be found. Another chapter is devoted to the indications of hydrotherapy and climatic conditions in nontuberculous diseases of the respiratory tract. In this chapter are discussed chronic bronchitis, pulmonary emphysema, asthma and chronic pulmonary suppurations. Roentgenograms of the chest and photographs of patients before and after treatment are reproduced. One chapter, which is profusely illustrated, is devoted to the technic and control of the treatment. The author is quite enthusiastic over the results of the treatment.