MUSEUM OF COMPARATIVE ZOOLOGY. 95 



light must traverse the cells from their deep to their outer (genetically 

 cousidered) ends. There is, therefore, a striking analogy between the 

 condition which obtains in the eye of the spider and that which prevails 

 in the case of all vertebrates. 



Saint Clocd, Minn., Dec. 1, 1885. 



LITEEATUEE. 



Ayers, H. 



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