GENERAL DISEASES. 85 



elevated temperature, and extravasation into the visible 

 mucous membranes. 



Symptoms. — The symptoms are somewhat variable. 

 Fever is present ; there is a yellowish discharge from the 

 nose, and sometimes the submaxillary glands are enlarged, 

 and may discharge. 



The visible mucous membranes are yellow, and present 

 petechise which are especially seen on the inner canthus of 

 the eye, and in the female in the vagina. The appetite 

 is generally good. The urine contains albumen, and is 

 highly coloured j and there is gradual progressive emaciation 

 and marked thirst. 



Sometimes in the early stages there is loss of motor power 

 in the limbs. Dropsical swellings are sometimes seen in 

 the mare between the fore-legs, and in the horse in the 

 sheath. 



Etiology. — The disease is due to the presence of an ani- 

 mal parasite in the blood. It is capable of being propa- 

 gated by subcutaneous or intravenous injection, or by intro- 

 duction into the alimentary tract of blood infected with 

 parasites. It is not known how the disease is spread, but 

 probably the parasite gains access into the system through 

 the drinking-water. 



Prognosis. — Death usually occurs in seven to ten weeks, 

 at the end of which time the animal may expire suddenly, 

 or may become delirious and death ensue more slowly. 



Morbid Anatomy. — The intestinal membrane is yellow, 

 and shows small extravasations. 



The peritoneal and pericardial sacs contain lymph. 



If fresh blood; be examined under the microscope, the 

 parasites may be seen in groups or singly. 



They have an oval-shaped body, separated from a 

 spheroidal head by a neck, and the tail tapers into a long 

 liagelium. 



