412 



Special Vertebrate Organogenesis 



distoproximal axis of the eye, and implanted 

 in the vitreous chamber of lensless eyes, 

 deliver lenses with decreasing frequency or 

 of decreasing perfection. 



It will have become evident from the fore- 

 going abbreviated summary that the mobili- 

 zation, elaboration, and growth of the many 

 components of the eye, as well as their 

 reconstitution following injury or loss, are 

 dependent at almost every step upon forma- 

 tive influences operating within the system 

 or brought to bear from without. This weld- 

 ing together of diverse parts into an inter- 

 locking, harmonious whole of remarkable 

 complexity and functional perfection repre- 

 sents one of the best investigated and at the 

 same time most challenging examples of 

 epigenetic phenomena in vertebrate morpho- 

 genesis. 



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