498 The Origin and Differentiation of the Lens 
Fic. 31. Experiment DF,,. Embryo rana palustris killed 4 days after the 
partial extirpation of the right eye. Section through regenerated right eye 
and lens-bud. The eye is separated from the ectoderm by mesenchyme. The 
normal left eye is in outline on the opposite side. »X 45 diameters. 
Fic. 32. Experiment DF,,. Lens-bud more highly magnified. x 360 
diameters. 
Fic. 33. Experiment DF,,. Embryo rana palustris killed 4 days after par- 
tial extirpation of the right eye. Section through regenerated eye and lens- 
bud. The eye is separated from the ectoderm by mesenchyme. The normal 
eye is similar to the one in Fig. 31. The lens-bud is very similar to that in 
Fig. 32. x 45 diameters. 
Fic. 34. Experiment dx,. Embryo rana sylvatica killed 4 days after the 
operation. Section through caudal portion of regenerated eye. Here its 
outer layer is towards the ectoderm and separated from it by mesenchyme. 
There is a small lens-bud opposite this portion of the eye. The normal left 
eye is similar to that of Fig. 29. X 90 diameters. 
Fic. 35. Experiment dx,. Lens-bud more highly magnified. x 360 
diameters. 
Fic. 36. Experiment DL,. Embryo rana sylvatica killed 5 days after 
partial extirpation of the right eye. Section through regenerated eye and 
lens-bud. The regenerated eye is separated from the ectoderm by mesenchyme. 
There is an artificial separation of the lens-bud from the inner layer of the 
ectoderm. X 90 diameters. 
Fic. 37. Experiment DL,,. Lens-bud more highly magnified. xX 360 
diameters. 
Fic. 38. Experiment DL,. Section through normal left eye and lens. 
x 90 diameters. 
Fig. 39. Experiment DF,. Embryo rana palustris killed 5 days after 
partial extirpation of the right optic vesicle. Section through regenerated 
right eye showing attachment to brain and separation from ectoderm by 
mesenchyme. The normal left eye is similar to the one in Fig. 75, experi- 
ment DF,,. X 90 diameters. 
‘Fic. 40. Experiment DF,,. Section through anterior end regenerated eye 
and small solid lens-sphere which is separate from the ectoderm. The outer 
layer of the eye is nearest the lens-sphere but separated from it by mesen- 
chyme. X 90 diameters. 
Fic. 41. Experiment DF,,. Lens-sphere more highly magnified. xX 360 
diameters. 
