Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . dicatethat the process de-pends upon the pro-longed action of someirritant the nature ofwhich is unknown. Iam strongly inclinedto agree with Nicholls,who is almost per-suaded that the pro-cess is bacterial inorigin. In some re-spects it resemblesthe chronic produc-tive form of tubercu-losis, and it is not im-possible that somecases are due to thetubercle bacillus. Theabsence of anatomictubercles, giant cells,and even inability todemonstrate bacilli,do not necessarilyconstitute conclus
Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . dicatethat the process de-pends upon the pro-longed action of someirritant the nature ofwhich is unknown. Iam strongly inclinedto agree with Nicholls,who is almost per-suaded that the pro-cess is bacterial inorigin. In some re-spects it resemblesthe chronic produc-tive form of tubercu-losis, and it is not im-possible that somecases are due to thetubercle bacillus. Theabsence of anatomictubercles, giant cells,and even inability todemonstrate bacilli,do not necessarilyconstitute conclusiveproof of its nontu-berculous nature. Itis possible that thechronic productiveserositis without ad-hesions may be differ-ent from the adhesiveform, but the reasonsfor recognizing themas distinct processesdo not appear con-vincing. Strongly resem-bling the foregoingare pericardiomedias-tinitis, or mediastino-pericarditis, and peri-carditis externa, whichare closely allied, ifnot identical conditions. The names given are applied to processescharacterized by a chronic indurative inflammation extending from. Fig. 239.—Lung. Chronic Lnterstitial Pneumonia, Bronchiectasis,Hyaloserositis, and a Terminal Catarrhal Pneumonia Due toMixed Lnfection by the Tubercle Bacillus and Pneumococcus. A , A. Greatly thickened pleura. B. Dilated bronchi. C. One of manybroad strata of fibrous tissue irregularly traversing the organ. D. Largecaseous lymph-node near hilum of lung and immediately adjacent to theaorta, a section of which is shown just above. The aorta is the seat ofslight atheroma. SEROrS MKMBKANKS. 475 the pericardium into the mediastinal tissues, which often become firmand resisting and closely attached to the sternum and costal condition may or may not be associated with the ordinary form ofptTK-arditis. whicli. for purposes of distinction, is calle<l pericarditis in-terna. When an inrtammation of a serous membrane terminates in acl-hesions which firmly unite the
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