= 
or 
0) 
Lens-Formation from Strange Ectoderm 
Fic. 33. Experiment DL.,. Optic vesicle transplanted caudal to the otic 
vesicle. Embryo killed 4 days after the operation. Section through trans- 
planted eye and lens, and medulla. Both transplanted eye and its lens are 
larger than the normal ones but not quite as far differentiated. The trans- 
planted eye is somewhat irregular. The medulla was injured. Compare with 
Fig. 36, which is similar to the normal eye of this embryo. X 90 diameters. 
Fic. 34. Experiment DL.,. Optic vesicle transplanted caudal to the otic 
vesicle region. Embryo killed 5 days after the operation. Section through 
transplanted eye, lens, and medulla. The optic cup shows regular invagina- 
tion and is about the same size as normal, but not as far advanced in its 
differentiation. The lens is irregular in shape, as large as normal, but not 
as far differentiated. Compare with Fig. 36. The ectoderm over the trans- 
planted eye shows early corneal changes. X 90 diameters. 
Fic. 35. Experiment DL.,. Optic vesicle transplanted caudal to otic 
vesicle. Embryo killed 4 days after the operation. Section through trans- 
planted eye and lens. They are separated from the ectoderm by a consider- 
able layer of mesenchyme, but the arrangement of the ectoderm and mesen- 
chyme immediately over the lens suggest that the eye has been pushed away 
from the ectoderm. There is a large ganglionic mass between the eye and 
the ectoderm. The transplanted eye is quite irregular and has a large blood- 
vessel in its cavity. The lens is as large as normal but neither are so far 
differentiated as in the normal eye. Compare Fig. 36. > 90 diameters. 
Fig. 36. Experiment DL,,. Section through normal eye and lens. X 90 
diameters. 
Fic. 37. Experiment DL,,. Optic vesicle transplanted caudal to the otic 
vesicle. Embryo killed 4 days after the operation. Section through trans- 
planted eye and lens. The eye lies dorsal to the anterior end of the Wolffian 
body. The transplanted eye is as large and as well differentiated as normal 
and its lens is as large but not as far differentiated as the normal lens. A 
large blood-vessel occupies part of the cup cavity. The section passes through 
the region of the choroidal fissure. > 90 diameters. 
Fig. 38. Experiment DL,,. Optic vesicle transplanted caudal to the otic 
vesicle into the region of the anterior end of the Wolffian body showing 
tubules. The transplanted eye and lens are as large as normal but neither 
are so far differentiated and both are more or less irregular. Compare with 
normal eye, Fig. 36. X 90 diameters. 
