THE HORSE EOT CESTEUS EQU1. 197 



respecting the true origin of this word, on which we shall 

 venture a suggestion that will appear, we believe, tolerably 

 satisfactory. The derivation of it, we apprehend, is from the 

 French word Bout, signifying the extremity or end of a thing, 

 in the way we see it in the words About, Bottom, Bottle, 

 Botville, &c. ; the last of these alluding to one living at the 

 end or extremity of a town, by elision or for brevity the u 

 being omitted. From the same origin also we have Butts, 

 houses placed without or at the extremity or end of a town, 

 the o in this case being for brevity omitted. Indeed the 

 instances of its application are very numerous in our lan- 

 guage. 



" The way or reason that these insects became so designated, 

 is pretty manifest, from the habits more particularly of the 

 second species of this enumeration, or Hcemorrhoidalis, 

 which being fully fed, its growth completed, in quitting its 

 habitation in the stomach, and passing through the intestines, 

 does usually hang for some days upon the margin of the 

 fundament, beneath the tail, then falling to the earth and 

 forming a chrysalis; and in this state would attract more 

 particular notice and attention, occasioning often serious in- 

 convenience and distress. So situated and observed, it was 

 denoted the Bout Worm or End Worm, and by contraction 

 Bot Worm; and afterwards, for want of better epithets, the 

 appellation became extended to the fly produced by this 

 worm, and we obtain Bot Fly, though it is obvious, as the 

 fly never affects these situations, its application is improper, 

 and has served to disguise and conceal the real origin of the 

 name." 



Clark describes the bots of the horse as follows : 

 " OESTRUS. Antennae with three articulations, the last glo- 

 bose with a bristle in front deeply sunk in the head. 

 Mouth, a simple aperture without a trunk. Palpi 



