CHAPTER XXIII 



THE EYES AND HOW TO PROTECT THEM 



THE special senses, seeing, hearing, touching, tast- 

 ing, and smelling, might be called the windows of Jack's 

 House. These are all of great use to our bodies, but 

 nothing takes more from the real joy of living than the 

 loss of sight. Not to see our friends and the beautiful 

 world about us ! Not to be able to run, play, read, 

 write, or do any work that requires seeing ! Think 

 how heavily time would hang, and what would be 

 taken from every hour's pleasure by such a misfor- 

 tune ! How much is lost even by seeing indistinctly, 

 or by being limited as to our amount of reading and 

 other close work ! We need only try to do something 

 with the eyes closed to realize how dependent we are 

 on them every waking moment. In fact, the eyes are 

 so valuable that our highest success and happiness in 

 life depend largely upon how much and how well 

 they can be used. 



To keep any machine in the best condition for use, 

 we should know the important things about its struc- 

 ture and working; and the same is true of our eyes, 



