190 SPECIAL BACTERIOLOGY 



blotches, terminating diffusely in the surrounding tissue. On cutting 

 through the skin, dark red blood escapes from the cut bloodvessels. 

 On section the abdominal cavity usually contains a large quantity of 

 straw-coloured lymph with numerous flocculi floating in it. 



The Large Intestines are sometimes agglutinated together with bands 

 of flocculent lymph, the adhesions being very resistant in some 

 parts. 



The Mesenteric Lymph Glands are usually enlarged, and on section 

 present a greyish-red striated appearance. The mucosa of the large 

 intestines is usually red and swollen, the ileo-caecal valve, or valve of 

 Bauhini, swollen and often the seat of extensive ulcerations. The 

 difference between ulceration and the deposition of caseous matter in 

 the follicle of the glands in the neighbourhood of the valve must be 

 carefully noted, otherwise an incorrect diagnosis will result. 



The Small Intestines usually present a reddish appearance (typhilitis), 

 the internal surface being studded with numerous dark red spots. The 

 mucosa is swollen, with diffused capillary redness, Peyer's patches 

 enlarged, and contents of intestines fluid. The characteristic ulceration 

 mentioned in connection with the ileo-caecal valve may also be present, 

 and, although involving the whole thickness of the bowel, perforation is 

 extremely rare. 



Liver. This organ is usually enlarged, edges rounded. On section 

 dark blood exudes, and the acini are considerably enlarged. Occa- 

 sional centres of necrosis have also been observed. 



The Gall Bladder is usually distended, and full of viscid, dark greenish- 

 yellow gall. 



The Spleen is sometimes enormously enlarged and the pulp slightly 

 disintegrated. Trabeculae thickened, the Malpighian corpuscles 

 enlarged, and sometimes a few white spots on the capsules. 



The Stomach is sometimes the seat of numerous ulcerations (see 

 Photo., Fig. 71), and in other cases the cardiac portion is healthy, while 

 the pylorus is congested and ulcerated. 



The Kidneys are sometimes enormously swollen, and in a state of 

 haematogenous nephritis, the pelvis in some instances being almost 

 entirely occluded with blood clots. Sometimes the kidneys are in a 

 state of parenchymatous degeneration, and small petechiae may also 

 be observed under the capsule, which may or may not be adherent. 



The Bladder sometimes contains haematogenous urine depending on 

 the condition of the kidneys. 



The superficial and deep inguinal glands are usually in the same 

 condition as those of the mesenteric and bronchial regions. 



Thoracic Cavity. It is in this part of the animal that such a wide 

 difference of opinion exists among experts, as to whether pneumonia is 

 or is not a diagnostic symptom of swine fever. The following thoracic 



