Pulmonary consumption, pneumonia, and allied diseases of the lungs : their etiology, pathology and treatment, with a chapter on physical diagnosis . ion will be discussed. The bron-chial mucous membrane is in a state of inflammation, andthe tube is filled with yellow material. The pneumonicpatches which were described as being present in the firstand second stages now very dense and heavy, andtheir nodules begin to soften in the center. The softeningprocess spreads from this point until the greater part of thenodule, in which it is located, is transformed into a yellowliquid mass. As a
Pulmonary consumption, pneumonia, and allied diseases of the lungs : their etiology, pathology and treatment, with a chapter on physical diagnosis . ion will be discussed. The bron-chial mucous membrane is in a state of inflammation, andthe tube is filled with yellow material. The pneumonicpatches which were described as being present in the firstand second stages now very dense and heavy, andtheir nodules begin to soften in the center. The softeningprocess spreads from this point until the greater part of thenodule, in which it is located, is transformed into a yellowliquid mass. As a rule communication is set up with abronchial tube, and the fluid is ejected and a cavity remainsbehind. This is well shown in Fig. i6. Sometimes a num- PATHOLOGY OF PULMONARY CONSUMPTION, zdi ber of small cavities are formed in this way in the sameneighborhood, and through the destruction of the interveningpartition they are all thrown into a large cavity. Tubercularnodules similar to those found in the deep layer of the pleuraare now frequently found on the vocal cords or somewherein the larynx, and sometimes on the tracheal Fig. i6.—Catarrhal pneumonia, third staple X50 diams.: a, thecavity formed by dissolution of the center of the caseous pneumonicmass; b, the caseous edge; c, the compressed air-vesicles filled withcaseating catarrhal products.—Hamilton. Microscopic examination of the center of such a pneu-monic patch in its first stage usually shows a small bronchusfilled with bronchial epithelial products, while the other partof the patch contains the air cells, which are filled withcatarrhal elements and which are grouped around the bron-chus, as in shown in Fig. 17. The catarrhal products in the air vesicles give rise to thecondensation, and it is these which may be pressed out. 262 DISEASES OE THE LUNGS. Fibrin is rarely present in the alveoli, differing thus fromcroupous pneumonia, in which the fibrous exudation is theprincipal cause of the conso
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