THE BULL. 



many devourers gnawing and tearing its back at once, of which it could not 

 poffibly rid itfelf: this infecT:, on the contrary, being perfectly fatisfied with 

 the moifture it finds in the tumour, gives the animal it feeds on little or no 

 unealinefs. 



As foon as the worm has attained its full growth, it works itfelf by 

 degrees out of the tumour, through the hole, and falls on the ground, where 

 it crawls about, till it has found a place of fafety to repofe in during its 

 feveral transformations : here it foon lofes all motion, and the Ikin becomes 

 hard and black, forming a Ihell to protect it from accidents, till the fly is 

 ready to make its appearance. When it is perfectly formed, it breaks 

 through one end of its prifon, and comes forth furnilhed with only two 

 wings, yet at firft light fo very like fome of the fmaller humble-bees, as to 

 be ealily miftaken for them. On attentive examination, however, it will be 

 found to poiTefs a mouth without teeth or lips, fliort glofly antennae rounded 

 at the ends, and reticular chefnut-coloured eyes. In the hinder and under 

 part of the body of the female, there is a cylindrical tube, which me can 

 protrude at pleafure, and with which Ihe pierces the Ikin of the animal, to 

 lodge her eggs, as has been already obferved. 



