58 EYE. 



which has to enter somewhere to make the retina on 

 which the image is received, does not enter exactly 

 at the centre, but a little towards the nose. Now, 

 mathematicians say, that owing to this slight vari- 

 ation from the centre, it can be calculated to a de- 

 monstration, that the little circle or image in the eye, 

 can never fall on both insensible parts at the same 

 time. The experiment is easily tried. Place two 

 small circles of white paper upon a dark colored wall, 

 at the height of the eye, and at the distance of nearly 

 two feet from each other. If the spectator, at a 

 proper distance, shuts his right eye, and looks with the 

 left directly at the paper on his right hand, he will 

 not see the left hand paper, although the objects 

 around it are visible. But let both eyes be opened, 

 and it will appear distinctly. 



Varieties of Eyes. 



T. Are the eyes of all animals constructed alike ? 



A. The differences are very numerous and strik- 

 ing. Besides the evidence of design in the structure 

 of the eye itself, we have a further proof of the exist- 

 ence of wisdom in its formation, and that, it is no blind 

 production of nature, when we observe that the sense 

 of seeing is not given to all animals in the same way, 

 but that the organs are varied as is best adapted to 

 the different kinds of animals. The varieties extend 

 to almost every part of the eye. Fishes have a re- 



