110 VETERINARY 



The worms of the human subject have not been 

 longer known to the world than those of the horse ; 

 and the farriers, in all ages^ who have undertaken 

 the care of these valuable animals, have had their 

 remedies for the long and short worm bred in their 

 intestines. The short ones are the creatures here 

 to be described ; but though the world has so long 

 been acquainted with their existence, it never 

 knew their origin, till M. Vallisneri discovered, of 

 late, that they were produced from one of these 

 flies, by insinuating itself into the fundament of 

 the horse. These flies always live in the open 

 fields, and are seldom found near towns or houses ; 

 and this is the reason that those horses which are 

 kept up in the stable in summer and autumn are 

 scarcely ever found to be so subject to these 

 worms. 



In the latter end of summer, and in autumn j 

 these flies are found continually buzzing about the 

 backs of horses in the open field, seeking an op- 

 portunity to deposit their eggs. Horses, at this 

 season, are sensible of the businefs of this little 

 annoyer, and have been seen, from the most quiet 

 state, to jump, run about, and kick, only at the, 

 sound of the wings of one of these flies. This in- 

 sect has been observed, when ithas not succeeded in 

 its first attempt, to fly with lefs noise towards a 



