INTRODUCTION 



use of the eyes of animals, which are procur- 

 able in large quantities, and which may be 

 used without "feelings" in the matter. 

 Though there is a difference between the eyes 

 of human beings and the eyes of other ani- 

 mals, the difference is slight and of minor im- 

 portance when compared with the similarity 

 of the more important parts. 



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