WORMS. 257 



sharp, and exceedingly numerous. Imme- 

 diately after their ejection tliey continue to 

 writhe and twirl most rapidly upon the sur- 

 face of the dung, bearing great affinity to 

 the action of an eel when taken from its na- 

 tural element and placed upon land. 



There is also sometimes seen adhering 

 closely to the same parts, and discharged in 

 the same manner, an indolent kind of bot, 

 appearing almost inanimate, that keeps its 

 hold only by a point like the leeth, and is, 

 in form, exactly like the grub or zcorm, that 

 may be so plentifully extracted (by pressure 

 only) from those prominences perceptible 

 upon the backs of horned cattle during the 

 hot months in the summer season. 



Thus much is introduced to prove the va- 

 jricty df those insects> in general so prejudi- 

 cial to the frame when once they have gained 

 admission, or secured their seats: respecting 

 which such a diversity of opinions have been 

 broached, and nothing finally satisfactory 

 ascertained of their origin, either in the hu- 

 man species or brute creation. Some avow 

 their animakulcty or eggs^ to take place in the 



VOL. I. S 



