320 



Microscopical Essays. 



their laft integuments, which is performed exa&ly in the fame 

 manner as in the paffage of the infecl; from the larva to the pupa 

 (late, fo that in this laft {kin, which is extremely delicate, the 

 traces of the pulmonary tubes, that have been pulled off and turned 

 out, again become vifible. 



All parts of the infecl;, and more particularly the wings and 

 their cafes, are at this time fwelled and extended, by the i air and 

 fluids which are driven into them through the arteries and pul- 

 monary tubes ; the wings are at this period foft as wet paper, and 

 the blood iffues from them on the leaft wound • but when they 

 have acquired their proper c^onfiftency, which in the elytra is very 

 confiderable, they will not give the leaft fign of any fluid within 

 them, though cut or torn almoft afunder. 



The pupa being difengaged from it's {kin, affumes a different 

 form, in which it is dignified with the name of a beetle, with a 

 difference of fex, being either male or female. 



The infee~l now begins to enjoy a life far preferable to it's for- 

 mer ftate of exiftence ; from living in dirt and filth, under briars 

 and thorns, it now raifes itfelf towards the flues, and fuftains 

 itfelf with the oozing liquors of flowers. 



Of the Musca Chameleon. 



We proceed to illuftrate the nature of the different transforma- 

 tions in infecls, by giving an account of the mufca chameleon :; 

 in the worm or larva condition it lives in the water, breathes by 

 the tail, and carries it's legs within a little fnout near it's mouth. 



When-' 



