622 Veterinary Medicine. 



Microbiology. The parasite is formed in the red globules and 

 blood serum of the affected sheep and closely resembles the mi- 

 crobe of Texas fever. In the blood globules the parasite is seen 

 in different forms, round, oval, oblong or curved and from one- 

 tenth to one-sixth the diameter of the red globule. A single red 

 globule may show from one to four of the microorganisms. They 

 may at times show indications of division, and at others, auto- 

 matic amoeboid movements, from one portion of the blood globule 

 to another, or from the periphery toward the centre. The affected 

 blood globules are usually enlarged, having lost their biconcave 

 outline, and become biconvex or spherical, with irregular crenated 

 surface, and a dull, lustreless appearance instead of a clear red or 

 yellow aspect. The protozoon stains readily in anilin red or 

 methylene blue. 



Lesions. The condition of the carcass was good or even high, 

 in sheep attacked when in good flesh, and in which the affection 

 ran a rapid and fatal course. In sheep attacked while in low 

 condition on the other hand, the case tended to be milder and 

 more prolonged, and the body was emaciated and anaemic. 

 Dropsical swellings were common on the ears and sides of the 

 head and neck. 



The skin, connective tissue, fat, and other normally white 

 tissues were usually of a yellow color, varying from sulphur to 

 lemon. color. The muscles were pale and soft with a yellowish 

 tinge. 



The blood was pale, thin and watery, especially in protracted 

 cases, formed a loose coagulum, or remained fluid with a grayish 

 red color. There was marked leucocytosis (1:4 or 5). 



The stomach and intestines were more or less icteric, and con- 

 tained little ingesta. 



The liver was congested, softened, shrunken in protracted 

 cases, colored of a deep yellow especially in the interior, and 

 with gorged biliary radicles so that the acini stood out very 

 prominently. The gall bladder was usually well filled with a 

 thick, flocculent bile, yellowish green, blackish green or choco- 

 late color. 



The spleen appeared shrunken, somewhat spherical, 2 to 3 ozs. , 

 firm, and with a dark, reddish brown pulp. 



The kidneys were greatly enlarged, weighing 12 to 16 ozs.. 



