PARASITOLOGY. 201 



Symptoms.— ThQ period of incubation is about five 

 days ; the temperature may reach 106 degrees Fah, 

 SwelHng appears in various parts of the body, as the 

 chest, abdomen or head ; there is a loss of appetite, 

 anemia and gradual emaciation. 



Trypanosoma Equiperdum (Equus— horse). 



Distribution. — America and Europe. 



Description. — The general appearance and method 

 of cell division does not differ from the description 

 given in the two preceding species ; the distinction 

 between the species is largely by the symptoms and 

 lesions produced. The protozoon measures about 

 twenty microns long, one and one-half to two microns 

 broad ; it is a trifle shorter than the Trypanosoma 

 Brucii. 



Life Cycle. — Its mode of multiplication is the same 

 as in the preceding species ; the method of inocula- 

 tion is by coition ; the diseased genital organ con- 

 veyes the protozoon ; the Trypanosoma is found in 

 the blood and also in the serum from the oedematous 

 and ulcerous parts- 



Animals Infested. — The horse, ass and dog. 



Parts Infested. — Primarily genital organs ; later 

 other parts. 



Name of Disease. — Maladie du coit; dourine; 

 equine syphilis. 



Symptoms. — In the mare oedemat'S e^wellings ap- 

 pear in the vulvar region, which de elo;3 in eight to 

 ten days after coition ; in the hore ), iii the sheath, 

 scrotum and penis ; the skin over these organs may 

 show eruptions, in the form of vesicles; later, after 

 the vesicles have ruptured, white spots appear. 



