O R PINE- A PPLE. 157 



viewed them in a good microfcope, and 

 found all the parts of the vermin com- 

 plete under the white fcale, when taken 

 off at a proper age without being bruifed^ 

 and when they come to a certain period 

 they force the fcale from the leaf, and fo 

 defcend to the bottom to grow to matu- 

 rity. 



MANY have thought the white infects 

 on the leaves to be inactive and not capable 

 of moving ; but that is impoffible : they 

 have no life at their firfl appearance on the 

 leaves ; for if brufhed off foon they leave 

 no mark on the leaves, are extremely thin^ 

 and quite dry ; but when they have re- 

 mained fome time on them, they become 

 thick in the middle, and if brufhed off at 

 that age, a foft gluey matter comes from 

 them, which is the bruifed infect arrived 

 to a fubftance ; but the Ikin is fo thin and 

 tender that it is broken by a flight touch. 



THAT they have life is evident ; for 

 where they flick to the leaves, although 



brufhed 



