160 Lens-Formation from Strange Ectoderm 
Fic. 39. Experiment DL,,. Optic vesicle transplanted caudal to the otic 
capsule. Embryo killed 5 days after the operation. Section through trans- 
planted eye, lens, and medulla. The transplanted .eye is of same stage of 
differentiation as normal and of about the same size or larger. The lens is 
nearly as large as normal but not as far differentiated. The anterior endo- 
thelial layer is forming over-the lens but is not as well differentiated as 
normal. > 90 diameters. ‘ 
Fic. 40. Experiment DL,,. Optic vesicle transplanted caudal to the otic 
vesicle and dorsal to the anterior end of the Wolffian body. Embryo killed 
5 days after the operation. Section through transplanted eye and lens, 
medulla, and anterior end of Wolffian body. The transplanted eye is fairly 
regular and somewhat larger than the normal eye, and as far advanced in its 
differentiation. Its lens is larger than the normal but not as far advanced 
in differentiation. The eye and lens are separated by a considerable thick- 
ness of mesenchyme from the ectoderm. X 90 diameters. 
Fig. 41. Experiment DL,;. Optic vesicle transplanted caudal to the otic 
vesicle. Embryo killed 5% days after the operation. Section through trans- 
planted eye and lens. The transplanted eye and lens are larger than normal 
and as far advanced in differentiation. Compare with Fig. 43. The trans- 
planted eye is quite irregular on one side but the portion surrounding the 
lens is fairly regular. The anterior endothelial layer is forming but is not 
as far advanced as in the normal eye. The ectoderm over the eye has a long 
injury process, the base of which is cut through in this section. Xx 100 
diameters. 
Fic. 42. Experiment DL,.. Optic vesicle transplanted caudal to the otic 
vesicle near the anterior end of the Wolffian body. Embryo killed 51% days 
after the operation. Section through transplanted eye and lens. Both are as 
large and as well differentiated as normal (Fig. 43). The transplanted eye 
is separated by a considerable layer of mesenchyme from the ectoderm. The 
anterior endothelial layer is forming over the pupil. X 200 diameters. 
Fic. 43. Experiment DL,;. Section through normal eye and lens. X 100 
diameters. 
