154 Lens-Formation from Strange Ectoderm 
Fig. 13. Experiment DL,. Section through normal lens. xX 200 diame- 
ters. 
Fie. 14. Experiment DL... Embryo killed 4 days after the operation. 
Section through irregular transplanted eye and lens. X 90 diameters. 
Fic. 15. Experiment DL.,. Section showing the attachment of the above 
lens to the ectoderm. XX 180 diameters. . 
Fic. 16. Experiment DL,,. Optic vesicle transplanted caudo-ventral to 
the otic vesicle. Embryo killed 31% days after the operation. Section througn 
the transplanted eye and lens caudal to the otic vesicle. The lens has evi- 
dently just broken away from its attachment to the ectoderm. The optic cup 
is about the same size, shape, and stage of differentiation as the normal. 
Compare with Fig. 18. Xx 90 diameters. 
Fic. 17. Experiment DL,,. Section through optic cup and center of the 
lens caudal to the above. The lens is not as far differentiated as the normal 
one but its volume is slightly greater. X 90 diameters. 
Fig. 18. Experiment DL,,. Section through normal eye and lens. X 90 
diameters. 
Fig. 19. Experiment DL,,. Optic vesicle transplanted ventral to the otic 
vesicle. Embryo killed 3 days after the operation. Section through irregular 
transplanted eye and caudal end of the lens, otic vesicle, and medulla. The 
lens has evidently just separated from the ectoderm, very likely during the 
preparation of the specimen. X 90 diameters. 
Fig. 20. Experiment DL,,. Section caudal to the above through edge of 
eye and lens. The lens is not of as great cross diameter as in the normal one, 
but is 4% longer and of greater volume. The transplanted lens is not as far 
differentiated as the normal. Compare with Fig. 21. » 180 diameters. 
Fic. 21. Experiment DL,,. Section through normal eye and lens. xX 90 
diameters. 
Fic. 22. Experiment DL;. Optic vesicle ventral to the otic capsule. Em- 
bryo killed 3 days after the operation. Section anterior to the otic vesicle 
through anterior end of eye and lens, showing the connection of the latter 
with the inner layer of the ectoderm. The lens is about the same diameter 
as the normal but is oval in shape and twice as long as wide. X 90 diameters. 
Fig. 23. Experiment DL;. Section through center of lens and trans- 
planted eye. Here the eye and lens are separated from the ectoderm by 
mesenchyme and the otic vesicle. > 90 diameters. 
Fig. 24. Experiment DL;. Section through caudal end of lens and edge 
of eye. Over the eye is a loop of ectoderm following the course of the dotted 
line and continuous at either end with the inner layer of the ectoderm. In 
this section the middle position of the loop is shown in diagonal sections. 
< 180 diameters. 
