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Microscopical Essays. 



Gemm'd o'er their heads, the mines of India gleam* 

 And heaven's own wardrobe has array 'd their frame ; 

 Where colours blend an ever-varying dye, 

 . And wanton in their gay exchanges vie. 



The females of the gall infecl, which have no wings, pals, 

 through no transformation ; while the male, which has two wings,, 

 palfes through the pupa flate before it becomes a fly,. The only- 

 change which takes place in the female gall infecl: (and which is-, 

 however, a very confiderable one) is this, that after a certain 

 time it fixes itfelf to the branch of the tree, without being able to- 

 detach itfelf • it afterwards increafes much in fize, and becomes 

 like a true gall ; the female, by remaining thus fixed, for th$- 

 greater part of her life, to the place where me was firft feen, has; 

 very little the appearance of an animal ; it is in this period of thei?- 

 life that they grow moft, and produce their young* while 

 they appear a portion of the branch they, adhere to ; and what is ; 

 more lingular, the larger they grow, the lefs they look like ani? 

 mals, and while they are employed in laying thoufands of eggs 5 . 

 one would take them for nothing but mere galls. The genera- 

 of gall infects is veiy. extenfive; they are to be found on almoft: 

 every £hrub and tree*. 



The pucerons, to arrive at their perfect ftate, pafs' through, 

 that of the femicomplete pupa, and. their- wings do not. appear; 

 till they have quitted their pupa. flate ; but as in all the families off 

 pucerons there are many who never become winged, we mult not; 

 forget to obferve, that tfiefe undergo no transformation, re- 

 maining always the fame, without changing their figure, though, 

 they increafe in fize, and. change their fkiru It is remarkable^. 

 4 that? 



