ACTINOMYCOSIS (LUMPY JAW). 



DESCRIPTION OF PLATES. 



Plate XXXIX. Actinomycosis. (From Johne's Eucyklopadie d. gesammt. 

 Thierheilkumle.) 

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



eaten away by the disease. 

 Fig. 2. Actinomyces fungus from a tumor of the jawbone in cattle, magni- 

 fied 550 times. 



Plate XL. Actinomycosis of the jaw. (Reduced one-half. From Johne's 

 Encyklopadie d. gesammt. Thierheilkunde.) The lower jaw is sawed 

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

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

 the mucous membrane of the cheek ; h, front view of a molar tooth ; 

 c, the skin covering the lower surface of the jawbone ; d, the jawbone 

 hollowed out and enlarged by the formation 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 ; e, a portion of the tumor whicli 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. 



Plate XLI. 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 actinomyces 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 broncho- 

 pneumonia. 

 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 ; h, artery ; e, a pneumatic lobule ; d, lobule containing 

 minute yellowish dots. In these the actinomyces fungus is lodged. 

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

 lobules, a. The fungus is sprinkled 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. 

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