508 The Origin and Differentiation of the Lens 
Fic. 73. Experiment DF,;. Embryo rana palustris killed 5 days after 
partial extirpation of the right optic vesicle. Section through regenerated 
eye and lens. Normal eye, as in Fig. 75. X 90 diameters. 
Fic. 74. Experiment DF,,. Embryo rana palustris killed 5 days after 
partial extirpation of the right optic vesicle. Section through large regen- 
erated eye and lens. X 90 diameters. 
Fic. 75. Experiment DF,,. Section through normal eye and lens. xX 90 
diameters. 
Fic. 76. Experiment DF,,. Embryo rana palustris killed 4 days after 
partial extirpation of the right optic vesicle. Section through large regener- 
ated eye and lens. X 90 diameters. 
Fic. 77. Experiment DF,,. Section through normal left eye and lens. 
< 90 diameters. 
Fic. 78. ExperimentDF,,. Section through normal eye of rana palustris 
killed 41% days after the operating stage. X 90 diameters. 
Fic. 79. Experiment DL,,. Embryo rana sylvatica killed 4 days after 
operation on the right optic vesicle. Section through degenerating left eye 
and small lens vesicle. A normal eye at this age is as in Fig. 77. x 90 
diameters. 
Fic. 80. Experiment DL... Embryo rana sylvatica killed 4 days after 
operation on the right optic vesicle. Section through degenerating left eye 
and small lens vesicle, compare with a normal eye at this stage, Fig. 77. 
x 90 diameters. 
Fic. 81. Experiment DL,. Embryo rana sylvatica killed 4 days after 
operation on the right optic vesicle. Section through degenerating left eye 
and small lens vesicle. Normal eye of an embryo at this age, as in Fig. 77. 
x 90 diameters. 
Fig. 82. Experiment DL,,. Section through more caudal part of same eye 
as in Fig. 81, showing second small lens vesicle which is entirely separate 
from the first. X 90 diameters. 
