IL] 



INCIPIEXT STRUCTURES. 



57 



actions, the most distingnished naturalists, certainly the 

 most distinguished erpetologists, entirely deny it, and it is 

 opposed to the careful observations of those known to us. 



The mode of formation of both the eye and the ear of 

 the hio-hest animals is sucli that, if it is (as most Dar- 



COBKA. 



winians assert processes of developTaent to be) a record 

 of tlie actual steps by which such structures were first 

 evolved in antecedent forms, it almost amounts to a de- 

 monstration that those steps were never produced by 

 " Natural Selection." 



The eye is formed by a simultaneous and corresponding 

 ingrowth of one part and outgrowth of another. The skin 

 in front of the future eye becomes depressed ; the depression 



