CIRCULATORY ORGANS 161 



ear veins, but has not been of sufficient importance to 

 occasion any losses. 



BLOOD 



Diseases of the blood of swine have received very 

 limited consideration up to the present time. 



Anemia 



Werner reported his observation of anemia in swine 

 that had been fed watery slop food, while Braasch ob- 

 served anemia in suckling pigs, but was not successful in 

 identifying the cause. The usual lesions of anemia con- 

 sist of lack of blood, paleness of the various tissues, 

 emaciation, and a jelly-like consistency of the fat. The 

 affected animals are depressed, weak, and gradually 

 become emaciated. Later edematous swellings occur in 

 the dependent parts of the body. 



Leukemia 



A few cases of leukemia have been observed in swine 

 on postmortem examination. The exact cause of disease 

 is unknown, but it is probably of an infectious origin. 



Lesions. Porcine leukemic cases thus far observed 

 are of the lymphatic type. The lymph glands become 

 enlarged, due to hyperplasia of the lymphoid tissue, and 

 there are frequently necrotic centers. By scraping the 

 cut surface of a lymph gland a milk-white fluid is ob- 

 tained. The spleen contains leukemic centers and is 

 enlarged, and the liver may be similarly affected. 



Cases of leukemia have not been studied clinically. 

 The disease is chronic in nature. 



SPLEEN 



The spleen is subject to hemorrhages and is engorged 

 in hog cholera and in other septicemic diseases. 



Necrosis 



Necrosis of the spleen is of common occurrence in 

 swine that have died as a result of injection of a virus 

 containing the Bacillus necrophorus. These centers vary 



