INFECTIOUS DISEASES 283 



only in one ease, in the mesenteric in another case, and may be found 

 m two or more groups of glands or practically all glands in other 

 ■cases. The changes in tlie lymph-glands consist of tumefaction, hyper- 

 emia and hemorrhage. In some cases there is evidence only of tume- 

 faction and hyperemia ; iu others there will be tumefaction, hyperemia 

 and hemorrhage. The color of the affected lymph-glands varies from 

 a scarlet red to almost black. In some cases there is a distinct hem- 

 orrhage just beneath the gland capsule. The affected glands are 

 usually less dense than the normal. 



Digestive tube. — There may be hyperemia and hemorrhage in the 

 mucous membrane, submucosa and subserosa of any portion of the 

 digestive tract. Pharyngeal submucous hemorrhages, petechial or 

 eechymotie, are relatively common. There may be a general hyper- 

 emia of the mucosa of the stomach and small intestines, but it is less 

 common in the mucous membrane of the large intestine. Petechial 

 or eechymotie hemorrhages are relatively common in the mucosa of the 

 small intestine. Subserous petechial hemorrhages of the stomach, 

 small and large intestine are of frequent occurrence and in some 

 cases the hemorrhages may be eechymotie. 



Spleen. — The spleen may or may not be tumefied due to accumula- 

 tion of an excessive quantity of blood, and consequently it will be 

 darker in color. There may be hemorrhages of varying size, particu- 

 larly near the hilus. 



Respiratory organs. — Submucous petechial hemorrhages of the epi 

 glottis are relatively common and hj some considered 'jharacteristie. 

 There may be petechial hemorrhages beneath the tracheal mucous 

 membrane. Petechial hemorrhages may be very prevalent throughout 

 the lung tissue or they may be few in number. Lung hemorrhages 

 are quite constant although cases are observed in which it is not pos- 

 sible to find these lesions. Pneumonia of the croupous type may occur 

 in the cephalic or cardiac lobes. 



Heart, — Subendocardial petechial or eechymotie hemorrhages and 

 subpericardial petchial hemorrhages are common lesions. 



Kidney. — Petechial hemorrhages may or may not occur in the kid- 

 ney. The petechial hemorrhages that occur in cases of hog cholera 

 are relatively small and sharply circumscribed. 



Bladder. — The bladder frequently contains petechial hemorrhages 

 which are according to some investigators pathognomonic of hog 

 cholera. 



Bones. — The lesions in bones occur in the red marrow and consist 



