ACTINOMYCOSIS. 



[Description of plates.] 



Platk XLT. Fig. 1 Actinomycosis of tlie jaw. The lower jawbone has been 

 extensively eaten away by the disease. Fig. 2. Actinomyces funj;us from a 

 tumor of the jawbone in cattle, magnified 550 times. Both figures are taken 

 from Johne's Encylilopiidie d. gesannnt. Thierheilknnde. 



Plate XLII. Actinomycosis of the lungs. Fig. 1. Transverse section of the 

 ventral lobe of the right lung, from a case studied in the laboratory. The 

 yellowish dots represent the places where the actiuomyces fungus is lodged. 

 The larger yellowish patches are produced by the confluence of a number of 

 isolated centers. The entire lobe is of a dark flesh-red color, due to collapse 

 and bronchopneumonia. Fig. 2. The cut surface of a portion of the principal 

 lobe of the same lung, showing the recent invasion of antinomycosis from the 

 other lobe: a, large air tube; 6, artery; c, a pneumonic lobule; d, lobule con- 

 taining minute yellowish dots. In these the actiuomyces fungus is lodged. 

 Fig. 3. Cut surface of a small jxirtion of another lung, showing a few lobules a. 

 The fungus is sprinkletl throughout the lung tissue in the form of yellowish 

 grains, as shown in the illustration. The pleural covering of the lung tissue 

 is shown in profile above. 



Plate XLIII. Actinomycosis of the jaw (lumpy jaw, etc.), reduced one-half. 

 (From Johne. in Encyklopjldie d. gesammt. Thierheilknnde.) The lower jaw is 

 sawn through transversely, i. e., from right to left, and shows the disease 

 within the jawbone itself; a, within the mouth, showing the papillfe on the 

 mucous membrane of the cheek : b, front view of a molar tooth ; e. the skin 

 covering the lower surface of the jawbone; d, the jawbone hollowetl out and 

 euLirged by the fornuition of cavities within it, which are filled with the soft 

 growth of the actinomycotic tumor. The section makes it appear as if the bone 

 were broken into fragments and these forced apart; c, a portion of the tumor 

 which has broken through the bone and the skin and appears as a tumor on 

 the cheek. The little roundish masses represent the granulomata (minute 

 tumors) in which the fungus vegetates. 



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