Or 
SS 
oo 
The Origin and Differentiation of the Lens 
Fic. 55. Experiment DL;,. Embryo rana sylvatica killed 3 days after 
transplantation of the optic vesicle into the otic region. Section through 
edge of outer layer of transplanted eye, ectoderm, and small lens-like vesicle. 
The transplanted eye has a large lens. X 360 diameters. 
Fie. 56. Experiment DL,,. Embryo rana sylvatica killed 4 days after 
transplantation of the optic vesicle into the otic region. Section through 
ectoderm, anterior end transplanted eye, and lens-like vesicle. The latter 
is near an injured place in the ectoderm. X 90 diameters. 
Fic. 57. Experiment DL,. Embryo rana sylvatica killed 3 days after 
transplantation of the optic vesicle into the otic region. Section through 
caudal edge of eye and ectoderm showing small lens-like bud. The trans- 
planted eye has a large lens, and this bud is probably an injury process. 
x 360 diameters. 
Fic. 58. Experiment DF,,. Embryo rana palustris killed 4 days after 
transplantation of the optic vesicle into the otic region. Section through 
one edge of the transplanted eye and small lens-bud. The transplanted eye 
has also another and larger lens. The normal left lens is similar to the one 
in Fig. 61, experiment DF,,. x 360 diameters. 
Fic. 59. Experiment DF,,. Embryo rana palustris killed 3 days after 
partial extirpation of the right optic vesicle. Transverse section through 
regenerated and normal eyes, and normal lens vesicle. Xx 90 diameters. 
Fic. 60. Experiment DF,,. Section caudal to above, through regenerated 
eye, and end of transplanted eye and small lens-bud. X 90 diameters. 
