The first edition of this valuable book was written in 1944 and titled, "Principles and Practices of Inhalational Therapy." So much new knowledge has been contributed since the first edition was written that this second addition was needed. The subject matter is clearly presented and easy to read. The author correlates the pathologic physiology of each disease entity with the physiologic principles which underlie the treatment of the condition by inhalation therapy and other procedures which have value in the management of respiratory diseases. The book is recommended to any one who desires to know the indications and rationale of the physiologic therapy of the disorders of breathing.