Pulmonary consumption, pneumonia, and allied diseases of the lungs : their etiology, pathology and treatment, with a chapter on physical diagnosis . been divided. It is of so frequent occurrence and gen-erally so widely spread that I cannot help believing that itplays a most important role in bronchitis whenever there isany consecutive interstitial pneumonia present. In Fig. 26is seen the thickened intima of one of the branches of thepulmonary artery. Professor Hamilton further states that as a result of thisobliteration two changes are conspicuous, viz., caseation andsoftening of the pulmonar
Pulmonary consumption, pneumonia, and allied diseases of the lungs : their etiology, pathology and treatment, with a chapter on physical diagnosis . been divided. It is of so frequent occurrence and gen-erally so widely spread that I cannot help believing that itplays a most important role in bronchitis whenever there isany consecutive interstitial pneumonia present. In Fig. 26is seen the thickened intima of one of the branches of thepulmonary artery. Professor Hamilton further states that as a result of thisobliteration two changes are conspicuous, viz., caseation andsoftening of the pulmonary tracts supplied by the affected* Op. cit., p. 76. . 286 DISEASES OF THE LUNGS. vessels, and dilatation of the capillaries in the , in discussing the influence of arterial occlu-sion on the formation of cavities in chronic catarrhal pneu-monia Professor Hamilton says: It sometimes happens,however, that a considerable portion of a catarrhal lungcaseates very rapidly and breaks down almost like a such a case the obliterated condition of the blood-vesselsleading to the part, such as that shown in Fig. 27, is ap-. ^g^v Fig. 27.—Catarrhal pneumonia, third stage. X50 diams. Showsthe obliteration which occurs in the branches of the pulmonaryartery, a, thickened tunica intivia of a branch of the pulmonaryartery leading up to a cavity; b, the narrow lumen of the same; c,air-vesicles filled with caseous catarrhal secretion and beginning todisintegrate.—Hamilton. parently the cause. As has been demonstrated by Fried-lander and others, an obliterative affection of the branchesof the pulmonary artery, such as that seen in syphilis, is ofcommon occurrences in phthisical lungs. The above figurerepresents a portion of a lung taken from the edge of aphthisical cavity, and in its center is shown a transversesection of a small branch of the pulmonary artery leadingup towards the cavity .... around the obliterated PATHOLOGY OF PULMONARY CONSUMPTION. 287 artery a
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