The Lens in An Albino Rat. 67 



In the ordinary rat 



Antero - posterior 4 mm 



Vertical 5 mm 



The effect of the convexity of the lens in all eyes is, of course, 

 to shorten the sight or bring rays to a nearer focus, so that distant 

 objects are lost in the confusion of rays. How far such a condition 

 of the lens has had to do with the coloration of the skin I have 

 nothing to say. I leave this to Mr. Poulton. 



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