304 BACILLI PATHOGENIC IN ANIMALS. 



veterinary reports, the disease never recurs a second 

 time. 



Post-mortem On making a post-mortem examination of the swine 

 that die, the skin at the reddened parts is found to be 

 infiltrated with oedematous and bloody fluid ; the 

 muscular tissue is soft, and of a greasy pale red 

 appearance ; the lymphatic glands, especially the glands 

 of the mesentery, are swollen, of a dark-red colour, 

 and show on the cut surface punctifonn haemorrhages. 

 The peritoneum is of a dirty-red colour, or covered 

 with ecchymoses ; the same is the case with the serous 

 membrane of the small intestine. The mucous mem- 

 brane of the small intestine is much reddened and 

 swollen, and the summits of the folds are deprived of 

 their epithelium and covered with blood ; the solitary 

 follicles and Peyer's patches are very prominent, and 

 here and there, especially in the neighbourhood of 

 the ileo-caecal valve, their place is taken by ulcers of 

 considerable size. Liver and spleen are moderately 

 enlarged. The lungs contain air and a large amount 

 of blood. There are small hemorrhages in the serous 

 layers of the pericardium, and constantly in the epicar- 

 dium of the auricles of the heart. 



Morphological In cover glass preparations of fresh blood, and also in 

 f ^ e J uice of Yar i us organs, in the lymphatic glands, and 

 in the muscles, we find large numbers of delicate bacilli. 

 These resemble most closely the bacilli of Koch's 

 mouse septicaemia, but they are somewhat larger and 



thicker ('6 to 1'8/i. in length), 

 and they also resemble the 

 latter in that they lie partly 

 between the blood corpuscles, 

 either singly or in pairs or 

 groups of four, and partly in 

 the swollen white corpuscles, 

 leading evidently to dege- 



Fig. 85. Pigeon blood containing 



the bacilli of swine erysipelas neration of these cells. The 



X 600. (After Shuts.) bacim gtain weU with the 



ordinary colouring materials ; they also retain their 

 colour on treatment by Gram's method. In sections the 



