164 Lens-Formation from Strange Ectoderm 
Fig. 50. Experiment DL,.. Optic vesicle transplanted caudal to the otic 
vesicle. Embryo killed 5 days after the operation. Section caudal to otic 
vesicle through transplanted eye, lens, medulla, etc. The pupil is directed 
ventrally. The lens is smaller than normal and not so far advanced. The 
lens is attached to the ectoderm just caudal to the eye by a long ectodermal 
process (see Fig. 51). XX 90 diameters. 
Fic. 51. Experiment DL,.. Diagram of the lens and ectodermal process 
from several sections. The caudal end of the lens is attached to the ectoderm 
by this long process. From the cephalic end of the lens projections of ecto- 
dermal tissue extend into the cup cavity so that the lens is developing from 
only a small portion of the ectodermal process. Adjoining the attachment 
of the lens process are other irregular ectodermal projections due to injury 
of the ectoderm. X 90 diameters. 
Fic. 52. Experiment DL,,. Optic vesicle transplanted ventral to the otic 
vesicle. Embryo killed 5 days after the operation. Section through trans- 
planted eye, lens, etc., showing deeply-placed eye. The irregular lens is 
connected by complicated strands of ectodermal tissue with the ectoderm and 
pharynx (see diagram). > 40 diameters. 
Fic. 58. Experiment DL.,. Diagram of ectodermal strands connecting 
lens with ectoderm and wall of the pharynx showing how the various parts, 
a, b, c, and p, of Fig. 52 are connected together. e, e, ectoderm; ph, pharynx 
wall. X 90 diameters. 
Fic. 54. Experiment DL.,. Optic vesicle transplanted ventral to otic 
vesicle. Embryo killed 5 days after the operation. Diagram of irregular 
ectodermal mass connected with the ectoderm and pharynx. One portion of 
it in contact with the eye has a large lens vesicle. ov, eye; e, ectoderm; 17, 
lens vesicle; ph, pharynx wall. X 90 diameters. 
Fig. 55. Experiment DL,. Embryo killed 5 days after the operation. 
Section through transplanted eye, etc., showing lens attached to ectodermal 
process which is attached to the wall of the pharynx. oc, otic vesicle. X 40 
diameters. 
Fic. 56. Experiment DL,,. Section through irregular lens and trans- 
planted eye. A few sections from above. X 90 diameters. 
