38 INSECTS INJURIOUS TO FRUIT. 



these enemies of the fruits, the microscope has enabled me to demonstrate many facts 

 otherwise difficult to prove. 



Figure 8 of this Plate shows the arrangement of the lenses of the eye. An ordi- 

 nary pocket-glass will reveal this in many of the beetles, some of the large flies, and 

 many other insects ; but so minute are these lenses in the eyes of Butterflies, Moths, 

 Dragonflies, etc., that a glass of much higher power will be required. 



