t 8 ] 



thefe imall animars began to be ob* 



ferved ; each fpecies was found to be 



furnifhed with inftruments adapted to 



keep up a proper proportion in the 



ceconomy of nature ; happily fome 



clear the furface of the earth from 



impure and fuperfiuous, fome the air 



of fetid and putrid matters, and-others 



muddy and itagnating waters of hetero- 



geneous or filthy mixtures ; they affift 



in preferving a due proportion among 



vegetables, by deftroying many which 



are inacceflible to the larger animals. 



DifTerent parts of the fame plant of- 

 ten afford nourifhment to difierent in- 

 fe£ts ; fome live on the flowers, as the 

 Curcuiwnes ; fome on the roots ,as the 

 Leptura ; and others on the leaves, as 

 the Phakncc ; and as the piants increafe, 

 fo does the number cf their refpedivl 

 inhabitants. La%, they carry D ff 



an ? 



