INSECT ENEMIES 



and of the methods used for their destruction. 

 The application of Paris green for the destruc- 

 tion of aphides or plant-lice is useless. If it is 

 true that Paris green is a poison when taken in- 



Fig. i8. The tip of a fuchsia branch ruined by the mealy-bug 



ternally, why is it that it does not afifect the aphis 

 when it is destructive to the potato beetle? This 

 is easily explained by obserying the difference 

 between these forms in the methods of feeding. 



67 



