I20 THE CULTURE 

 through which the air enters into their 

 lungs ; and all the kinds of worms, and 

 caterpillars which change into flies, do, in 

 their principal organs and transformations, 

 fomewhat refemble thofe of the filkworm. 



From what has been faid, it will eafily 

 appear that their ficknefs is not fleep, or a 

 flate of reft, though .by fome called fo j 

 but rather a fever, like that which accom- 

 panies the toothing of children, or the cas- 

 ing of the feathers in birds, attended with 

 a lethargick motionlefs ftate, which indeed 

 refembles {leep, and a total lofs of appetite, 

 and abftinence from food till they caft their 

 fkins and the diforder goes off. 



The final caufe of their thus cafting 

 their fkins, &c. feems to be, that their bodies 

 may have room to grow and enlarge ; 

 their old fkins, it is likely, growing too 

 tough to admit of further extenfion, for 

 which reafon a new and tender one is ne-. 

 celTary. 



I hinted above, that though the duration 

 of their ficknefs, and of their fubfequent 

 health, is fet down at three days each, 

 from the beginning of their firft moult to 

 the end of their laft, yet this fhould not be 

 taken in too Uriel a fenfe, fmce they eat a 



little 



