The author's study of this condition is based on observations in 100 cases. He believes that the classic textbook descriptions do not really fit the actual clinical observations. The cavernous breathing, for example, always regarded as a major and constant symptom, is not always present. In spite of definite and proved formation of cavities it may be absent. Typical cavernous blowing respiration was present in only about 50 per cent of the cases. On the other hand, various moist râles are always present and are the most constant physical observation in the cavity. They have great semiologic value on account of the peculiarity of pitch and note. The peculiar modifications of the transmitted voice on combined auscultation and percussion and the vocal fremitus and additional signs aid in definitely locating cavities. They are by no means constantly present.
The author attaches great importance to the counting of Cushman's spirals in