TO THE PUPIL. 



EECENT careful and extended examination shows 

 -' that diseases of the eye, such as near-sight, are 

 lamentably frequent among school-children. Your eye- 

 sight is worth more to you than any information you are 

 likely to gain from this book, however valuable that may 

 be. You are therefore earnestly cautioned: 



1. To be sure, in studying this or any other book, that 

 you have sufficient light. 



2. That you do not allow direct rays of light to fall 

 upon your eyes, and that you avoid the angle of reflection. 



3. That you avoid a stooping position and a forward 

 inclination of the head. Do not read with the book in 

 your lap. The distance of the eye from the page should 

 be not less than twelve inches (30 cm.) nor more than 

 eighteen inches (45 cm.) Hold the book tip. 



4. That you sit erect when you write. The light 

 should be received over your left shoulder. 



5. Especially, that you avoid, as much as possible, books 

 and papers poorly printed or printed in small type. 



6. That you cleanse the eyes with pure soft water 

 morning and night, and avoid overtaxing them in any 

 way. 



