This is a comprehensive and authoritative book on the physiologic basis and technics of inhalational therapy. The author is particularly well qualified to write such a book by virtue of his extensive clinical and experimental training in this field. The text is concise, carefully edited and practical in content and presentation. It is an excellent summary and a careful evaluation of the entire field. The material covers the historical and physiologic background of inhalational therapy in all its aspects from the use of gases, positive pressure and respirators and the equalizing of chest pressure to the use of vaporized solutions with sympathomimetic drugs. The author summarizes the etiology, pathologic physiology, symptoms and management by inhalational therapy of acute anoxia (acute altitude sickness), pulmonary diseases, cardiac and cardiovascular diseases, migraine, seasickness, hemorrhage and many other conditions for which inhalational therapy is of value. Besides the material on the use of inhalational