ER 
The embryo was killed the fifteenth day after the operation. More 
pressure than was intended must have been applied for a part of the 
brain of this side and the eye were pressed downwards. The eye is 
connected to the displaced piece of brain tissue, its optic nerve growing 
into it; but it lies under the brain, below and median to the left eye, 
with its normally inner pole toward the brain and its cavity directed 
toward the roof of the pharynx. In the cavity of the optic cup no 
lens is present but its margin shows an early stage of lens formation. 
At the normally inner pole of this eye near the floor of the brain is 
a small lens lying free in the mesoderm but still connected by a thin 
cord to the pigment layer of the retina. 
SR: 
5. 
is) 
90 
Fig. 2. Embryo 121. Section of brain through intracranial eye. ch chorioid. 
e epithelium of lens. J elongated clear cells of lens. op optie stalk. p pigment layer 
of retina. R regenerated brain wall. At retina. rc layer of rods and cones. X 200. 
Embryo 313, 3 mm long. This embryo was operated as 314 and 
killed the twentieth day after the operation. An eye regenerated from 
the brain on the operated side and grew against the reversed eye, the two 
retinae flattening out and fusing by their ganglion cell layers. The 
rods and cones of the reversed eye are directed dorsally and to the 
left. A large lens is present near the normally inner pole. The 
pigment layer of the retina divides into two distinct layers which 
oe 
