506 The Origin and Differentiation of the Lens 
Fic. 67. Experiment DF,. Embryo rana palustris killed 3 days after 
partial extirpation of the right optic vesicle. Section through large regen- 
erated eye and lens-bud. X 90 diameters. 
Fic. 68. Experiment DF,. Section through normal eye and lens vesicle. 
x 90 diameters. ; 
Fic. 69. Experiment DF,. Embryo rana palustris killed 3% days after 
partial extirpation of the right optic vesicle. Section through large regen- 
erated eye and lens vesicle. X 90 diameters. 
Fic. 70. Experiment DF, . Section through normal eye and lens. xX 90 
diameters. 
Fic. 71. Experiment DF,,. Embryo rana palustris killed 4 days after par- 
tial extirpation of the right optic vesicle. Section through regenerated eye 
and small lens. Normal eye, as in Fig. 77. 
Fic. 72. Experiment DF, . Embryo rana palustris killed 4 days after 
partial extirpation of the right optic vesicle. Section through the regener- 
ated right eye and small lens, both are separated by a considerable layer of 
mesenchyme from the ectoderm. Normal eye, as in Fig. 77. X 90 diameters. 
