No. 494] 



NOTES AND LITERATURE 



dorsal line and the rigid optic-vesicle of anotht 

 the same size was put completely inside, the 

 vided it had not become too far differential 

 lens. In another case a lens was formed fron 

 derm although the cavity of the optic-cup was 

 the surface. An optic-vesicle which came in 

 early nasal organ caused this structure to forr 

 the lens of one eye budded off another lens U 

 vesicle which was placed adjacent to it. 1 

 seem to show that all ectoderm cells before be 

 to any considerable extent have the power tc 

 lens cells, though all of his experiments arc 

 vincing. 



A lens failed to form from the endoderm 

 opened and the optic-vesicle turned down int< 



King with the frog and Dragendorf with tin 

 that the optic-vesicle may regenerate when 



completely destroyed the 

 takes place. Bell, on the 

 half of the brain is remc 

 optic-vesicle forms on th 



found a new optie-vesicl 



it at the proper time. 



Bell finds that the opti< 

 induced to follow a path 



The olfactory lobes of 

 with ectoderm out of the 

 formation of nasal struc 

 generated if removed at 



