204 



RE GENERA TION 



a number of more recent workers, so that there remains no question 

 as to its accuracy. 



After the removal of the old lens the wound in the cornea 

 quickly heals, and in the course of two or three weeks a thickening 

 appears at one point at the edge of the iris (Fig. 60, A). The cells 

 that produce this thickening are the ordinary deeply pigmented cells 

 of the iris, where the outer layer of cells of the iris becomes continu- 



FlG. 60. After Wolff. Regeneration of lens of eye of Triton. A. Edge of iris with beginning 

 lens. B, C, D. Later stages of same. E. After Fischel. Whole eye with regenerating lens. 



ous with the inner layer. The cells increase in number and produce 

 a spheroidal ball that hangs down into the space formerly occupied 

 by the lens (Fig. 60, E\ The cells become clearer by absorbing 

 their pigment and arrange themselves concentrically as in the normal 

 lens. When fully formed the new lens separates from the iris and 

 occupies the normal position. 



The most surprising fact in connection with the development of 



