Microscopical Essays. ig% 



of thefe little animals fuited and adapted with the moft minute 

 exa&nefs to the immediate manner and convenience of their ex- 

 igence ; which again are fhihed and changed, upon the infecls 

 commencing a new fcene and ftate of action. 



In it's larva ftate the infect appears groveling, heavy, and vo- 

 racious, in the form of a worm, with a long body, compofed of 

 fucceffive rings; crawling along by the afliftance of thefe, or 

 fmall little hooks, which are placed on the ride of the body. It's 

 head is armed with ftrongjaws, it's eyes fmooth, entirely deprived 

 of fex, the blood circulating from the hind part towards the 

 head. It breathes through fmall apertures, which are fituated on 

 each fide of the body, or through one or more tubes placed in the 

 hinder part thereof. While it is in the larva ftate, the infecl: is as 

 it were mafked, and it's true appearance concealed : for under 

 this .mafk the more perfecl form is hidden from the human eye. 



In the pupa ftate the infecl: may be compared to a child in 

 twaddling clothes ; it's members are all folded together under the 

 breaft, and inclofed within one or more coverings, remaining 

 there without motion, i While in this ftate, no infecl; but thofe 

 of the hemiptera clafs take any nourishment. This change is 

 effected various ways ; in fome infefts the fkin of the larva opens, 

 and leaves a paffage, with all it's integuments • in others, the 

 {kin hardens and becomes a fpecies of cone, which entirely con- 

 ceals the infecls ; others form or fpin cones for themfelves, and 

 in this ftate they remain till the parts have acquired fufticient 

 firmnds, and are ready to perform their feveral offices, 



The 



