THE CAD FLY. 529 



this flxell, which is of a texture too hard for the animal 

 to break, with a valve at one end, faftened only by a 

 fmall thread. At the firft effort for freedom which the 

 young aeftrus makes, the door gives way, the prifon 

 opens, and the infeft flies to thofe woods and meadows 

 that were frequented by its ancellors *. 



* Reaumur, ubi fupra, 



Vol. III. 3 X 



