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A Manual of Veterinary Physiology. 



eyes are placed in the head, and the convergence of axes 

 of the eyeball, a ray of light from any point is imprinted 

 upon the same part of the retina in both eyes, and we see 

 it not as a double image, but as a single one. 



This explanation does not apply to the horse or ox ; no 



Fig. 35. — Diagram illustrating Corresponding Points. (Fostek.) 



z' x' y f are points in the right eye corresponding to z x y in the left 

 eye ; v 1, visual axis. The two figures helow illustrate the cor- 

 responding points on the retina, described in the text. 



matter how greatly the eyes may be converged in order to 

 see an object, the rays of light do not fall on the same sido 

 of the retina, but on opposite sides of it. The diagram 

 ( Fig. 36) will make this point clear. 



The outer part or temporal side of the retina in the 



