516 Experimental Studies on the Origin of the Lens in Amphibia 



the ectoderm by a long narrow pedicle there can be but little doubt as to 

 its origin. This long epithelial process was probably formed at the time 

 of the healing of the operation wound and thus gave the deeply placed 

 eye a chance for contact with the ectoderm. 



Fig. 18. Fig. 19. 



Fig. 10. Experiment DFn. Oblique section through the regenerated eye. X 45 diameters. 



Fig. 17. Experiment DF47. Oblique section through the regenerated eye. X 45 diameters. 



Fig. 18. Experiment DF47. Section through lens and edge of transplanted eye. X 175 

 diameters. 



Fig. 19. Experiment DF47. Section through transplanted eye. X 45 diameters. 



Experiment DF^-^. 



The embryo was killed four days after the operation. Fig. 16 from 

 a section through the regenerated eye shows a lens about 40|ii in diam- 

 eter that has apparently just" broken, away from its attachment to the 

 inner layer of the ectoderm. Fig. 14 is from a section 270/i, caudal to 



