250 DISEASES OF TRUE INFECTION. 



tuberculosis has taken the form of lobular pneumonia, separating 

 certain sertions in the lungs. In these cases cheesy masses of tuber- 

 cular matter were generally found. The hepatized tissue of the 

 lungs often breaks down, and large sections of the lungs remain, 

 while the broken-down portion is coughed up, leaving a series of 

 irregular, cavernous spaces, frequently hollow and. at other times 

 filled with pus-like masses. In one case they were directly against 

 the large bronchia, although this condition is rare. In nearly 50 

 per cent, of ill cases the lymphatic glands of the thorax, especially 

 the bronchial glands and the glands which are located above and 

 hehind the mediastinum, are invariably infected to a marked degree 

 -with tubercular deposits, and are found to be very often enlarged, 

 forming large tumor-like masses. These consist of a lardaceous 

 tissue and generally contain a centre cavity filled with a cheese-like 

 mass. True cheesy tuberculosis is rare in the dog; on the other 

 hand, we have a peculiar process of absorption of the tissues, form- 

 ing white masses, which on examination are found to be tuberculous 

 deposits, or have undergone fatty degeneration. 



When the process of breaking down, or disintegration, has gone 

 on to any marked degree, the tuberculous mass forms a tumor-like 

 body containing in its centre a whitish fluid held in fibrinous tissue. 

 This was noticed in 50 per cent, of the cases observed in the dog 

 where the lymphatic glands had undergone this degeneration. In 

 the other half of the cases the serous membranes of the abdominal 

 cavities were covered with tubercular masses, the pleura being the 

 common seat of the disease. In the majority .of cases of pleural 

 tuberculosis it takes the form of what is known as the " pearl " 

 tubercular masses. These are known to be deposits of soft connec- 

 tive tissue, of numerous conglomerating granulations, or in large 

 round tumors. In some cases there is extensive exudative inflam- 

 mation present (sero-fibrinous and purulent pleuritis). Two cases 

 of tubercular inflammation were found in the pericardium, and a 

 very peculiar alteration of the mediastinum has been observed in 

 several cases. This part was changed into a large, thick, partially 

 folded, or twisted leaf-like body. This consisted of tubercular 

 tissue with tubercular masses in enormous quantities lying on its 

 surface. The heart, as a rule, rarely presents any tubercular for- 

 mations. In the digestive organs the lymphatic glands of the head 

 and neck are rarely invaded ; also the submaxillary and retro- 



