6o 



THE MICROSCOPE. 



these also that in the larva of the Ephemera margin ata 

 the smaller currents diverge into the gill-like append- 

 ages with which the body is furnished." 



The various organs of insects will supply you with 

 inexhaustible subjects for study and interest. A com- 

 mon fly from your window pane will furnish you with 



Eye of Fly magnified. 



matter for examination for some time ; and I would 

 recommend the common fly as a sample of insect 

 structure. Under a simple lens you will observe the 

 numerous facets of the eyes, the number and position 

 of the nervures on the wings ; you may then select its 

 various members for examination. Cut off the head, 

 and view it as an opaque object by reflected light; 

 you. will notice that each eye is made up of numerous 



