200 HIDDEN BEAUTIES OF NATURE 



There are some thousands of these facets or ocelli 

 in the eyes of any insect whether fly, bee, or beetle, 

 yet it does not follow that so many images are 

 depicted on the creature's retina or conveyed to its 

 brain. 





Fig. 54. A small portion of Eye ot" Water Beetle (Dytiscus marginalia). 

 Enormously magnified. 



If an image of any object should fall on one facet, 

 that image would be sufficient to enable the creature 

 to see the object. 



If the microscope be arranged in a vertical position, 

 and only one tube used, a very interesting effect may 



