Woi^ms. 43 



under the symptoms I have detailed, the same plan of treatment 

 which I have ah-eady laid down, for those affected with the Round 

 Worm, may be had recourse to. And as it must be acknowledged 

 that it is extremely difficult, in some cases, to keep the Bowels entirely 

 free from the Ascaris, it may be admissible during- the hot months of 

 the year, to mix twenty grains of Calomel in each of the Worm 

 Powders, especially if the weather be steadily warm and dry. In 

 these cases however the use of the Aloctic Purgative must not be 

 dispensed with. 



Now as Calomel, if given to Horses in the manner and under th»* 

 circumstances which I have described, may be administered with im- 

 punity, at least, I make this concession in favour of its safety, ra- 

 ther than of its efficacy; knowing well the popular prejudice that 

 exists respecting it, and that even many well-informed Medical Men 

 are determined advocates for its use. 



I now proceed to the consideration of the subject of the Bot, for 

 the following remarks upon wliich, I am chiefly indebted to the in- 

 genious Mr. BiiACEY Clarke,, of London. 



Until the appearaace of this Gentleman's Treatise, containing a. 

 very satisfactory investigation of the Natural History of the Bot, no 

 subject connected with the Diseases of Horse«, was involved in great- 

 er obscurity, or had given greater scope to the boldness of Empiri- 

 cism, or the speculations of those who love to indulge in the visionary 

 dreams of Hypothesis. Mr. Clarke has proved, that two kinds of 

 Bots are commonly found in the stomach of the Horse, and thinks it 

 probable, that a third may occasionally inhabit there. He has dis- 

 covered that the Bot is a Larva or Caterpillar produced from the Egg; 

 «f a particular species of the Genus CEstrus or gad-fly which, like 



