166 Lens-Formation from Strange Ectoderm 
Fic. 57. Experiment DL,,. Optic vesicle transplanted medial to otic 
vesicle. Embryo killed 5 days after the operation. Section through trans- 
planted eye and lens, medulla, otic vesicle, etc. The transplanted eye is very 
irregular and deeply situated. Its lens is also very irregular (see Fig. 58). 
The sections are not cut through the principle axis of the lens. There are 
two groups of lens fibers, the smaller one is in the epithelial layer. The 
pole of the larger group which is normally towards the retina has become 
shifted around and appears to be directed towards the lens cavity. x 90 
diameters. 
Fic. 58. Experiment DL.,. Diagram of irregular lens with its ectodermal 
processes made by projection of several adjoining sections. One part pro- 
jects between otic vesicle (oc) and the edge of the optic cup. On the other 
side of the lens a large irregular ectodermal process runs to the roof of the 
pharynx and is fused in several places with it. The line of fusion is readily 
distinguished. > 100 diameters. 
Fie. 59. Experiment DL,. Embryo killed 5 days after the operation. 
Section through irregular transplanted eye and lens. The irregular lens is 
connected in two places with an irregular branching mass of ectoderm which 
in turn joins the roof of the pharynx. X 90 diameters. 
Fic. 60. Experiment DL,,. Diagram of the irregular ectodermal mass 
with lens and a small vesicle attached, also showing double attachment to 
the roof of the pharynx. X 90 diameters. 
Fic. 61. Experiment DL,,. Optic vesicle transplanted anterior to the otic 
vesicle. Embryo killed 5 days after the operation. Section through irregu- 
lar eye and lens. The lens is very irregular, a portion of it in the optic cup 
shows formation of lens fibers. The outer pole of the lens is very irregular 
and is connected with the ectodermal masses a, a. XX 90 diameters. 
Fic. 62. Experiment DL,. Section through lens mass 3 sections 30 uz 
anterior to the above showing very irregular portion of lens connected with 
irregular ectodermal strands. The strand passing towards the ectoderm was 
probably at one time connected with the inner layer. X 180 diameters. 
