In this short monograph Dr. Hernán Oyanguren M. reviews his experience in the treatment of pulmonary infections (lung abscess, bronchiectasis, and so on). His opinions follow, in general, those expressed in almost every modern textbook on the subject and in most of the literature of today. The monograph might well be used as a chapter in such a work. Although written in Spanish, it is easily read by any one who has a slight knowledge of that language, and the summary, which is translated into English, makes it available for American physicians. The author demonstrates that even a comparatively small number of cases can be used as a basis of an excellent piece of work, provided sufficient care is taken in their study.