STRUCTURE OF THE EYE 



2 57 



A prism separates white light into colors of the spec- 

 trum. 



made up of these various colors by passing it through a 

 prism, a triangular shaped glass such as we often see in the 

 candelabra in old houses. If a ray of sunlight were 

 passed through this prism to a screen in a darkened room, 

 we could see all the 

 rainbow colors of the 

 spectrum. If we al- 

 lowed this light to 

 pass through a sec- 

 ond prism placed in 

 a reversed direction 

 (see diagram) , the 

 colors would again 

 be brought together, 

 and passed out as white light. The rainbow is nothing 

 more or less than light passing through falling drops of 

 water, which act as prisms, thus separating light into its 

 elements, red, orange, yellow, green, blue, and violet. 

 Structure of the eye. We are now ready to learn 



something about the 

 structure of the eye. 

 Our eyes are among 

 the most delicate and 

 wonderful structures 

 in the body. We 

 abuse them con- 

 stantly, yet they serve 

 us well. Notice how 



The spectrum colors can be reunited by a second 

 prism so as to produce a beam of white light. 



well they are protected by being set in a bony socket, and 

 how admirably the lashes serve to keep out dust and dirt. 

 See, too, how tears flow every time any dust gets upon 

 the delicate membranes of the eye. Also observe, how the 



H.-.WHIT CIV, SCI. IN THE HOME I? 



