EYES AND CAMERAS. 



WHEN you have longed to own a camera, did it ever occur to 

 you that you already had two, and that you could not avoid 

 taking pictures all day long unless you closed your eyes ? 



The eye, like the camera, is a box, blackened on the inside 

 and divided into two unequal chambers by a partition with a 

 lens in it that, like a little round window, is directly in line 

 with a hole in the front. These are the essentials of a good 

 camera, though the little " pin-hole " cameras that boys some- 

 times use are even simpler. 



FIG. 35. DIAGRAM OF HUMAN EYE. 

 C Cornea. L Lens. / Iris. ON Optic nerve. CP Ciliary processes. 



But some one who has owned a camera and who knows all 

 about them says that though our eyes may be black inside, and 



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