INDEX, :m 



Eels in pafte, how procured, 151 ; defcribed, 511 ; in vinegar, 



510; in blighted wheat, 518. 

 Eggs of infects, 265, 269. 



Elytra of infects, 368; of the curculio imperialis, 368. 

 Earwig defcribed, 374. 



Eyes of infe&s, 375; of a libellula, 382 ; of the monoculus 

 polyphemus, 383. 



F 



Focus, what, 34, 



Feathers, or fcales of a moth's wing, 370. 

 Forficula auricularia, or earwig, defcribed, 374, 

 Fifh, their fcales, 391. 

 Flea defcribed, 691. 



G 



Glafs globules ufed as microfcopes, 8 ; invention attributed to 

 M. Hartfoeker and Dr. Hooke, ibid, method of making them, 

 9, 13 ; ufed with fuccefs by T. De Torre of Naples, 10 ; 

 apparatus neceffary for making them, 10. 



Globules of glafs ufed as microfcopes, 13 ; method of making 

 them, 13. 



Gray, Stephen, inventor of the water globules, 13* 

 Gnat defcribed, 702, 



H 



Hartfoeker, invention of glafs globules attributed to him, 8. 

 Hooke, Dr. the manner of making glafs globules in 1656 

 defcribed by him, 8; his method of ufmg the fingle micro- 



4 S 2 - fcope, 



