142 CHAPMAIn^ on PLY-DISEASE. 



the being bitten by numbers is likely to induce headache, 

 as with the irritation of mosquitoes. The symptoms, as I 

 have observed them, are, first, in the ox, a swelling under 

 the throat, which, if lanced, emits a yellowish fluid. 

 The hair stands on end, or is reversed. The animals 

 become debilitated ; and, though the herbage be ever 

 so luxuriant, refuse to eat their fill, and become thin. 

 The eyes water, and at length, when the end is 

 approaching, a continual rattling in the throat may be 

 heard at a few paces' distance. It sometimes happens 

 that a fly-bitten ox will live, but very rarely, and only 

 when it has no work to perform. Work and rain are 

 great precipitators of their end. In horses the symptoms 

 are swelling about the eyes, nostrils, testes, the hair is 

 reversed, and, though they have the best of food, they 

 become thin, sleepy, and, pining gradually, at length die. 



" Both cattle and horses live from fourteen days to 

 six months after having been bitten by Tsetse, but they 

 generally die after the first rain has fallen. A dog dies 

 in ten or twelve days, or two or three weeks at latest. 

 It is perceptible in the eyes, v/hich are swollen and 

 protruding. After death the heart of an ox is generally 

 incased in a yellowish glutinous substance, which might 

 be mistaken for fat. The flesh is full of little bladders 

 of fluid, and the blood also is half fluid, which becomes 

 congealed on cooling. The vitals are of a livid colour. 



" The Tsetse-fly is generally found within a few miles 

 of water, in rich sandy ridges near marshy spots, and 

 generally in mopani or mimosa forests. I have known 

 them to shift their positions, or encroach on new ground, 

 or leave pai'ts where fire-arms have driven the game ouu 

 of a district. They are mostly only found within a 

 certain range from water. To the buflalo in particular 

 the insect is more attached, and often moves about with 

 them in the rainy season" (Vol. I., pp. 175-177). 



Author's oxen and horses discovered to have been 

 bitten by the fly, in, the Mahololo Country, on the Chole 

 liiver, W. of the Victoria Falls : two or three cattle die ; 

 the " speedy death " of the remaining animals considered 

 inevitable (Vol. I., p. 180). 



Tsetse on the south hank of the Zambesi, dose to and a 

 little to the loesl of the juru lion of the Gaai or Quagga R.— 



