574 ELIZABETH HOPKINS DUNN 
structures. The position of the perikarya, also, and the rela- 
tions of the medullated nerve fibers are those of a bit of inverted 
cerebral cortex. The capillary blood supply appears to be 
derived through the cicatricial adhesion to the plexus choroideus 
of the lateral ventricle. 
AOD yee 
v 8 &@ 
TSE’ @ &, 4 
Showing attachment of transplanted portion (A) 
Fig. 2. Detail of figure 1. 
The cortex is inverted and adherent to the 
to hippocampus (//) at the left. 
choroid plexus (C. P.) from which it seems to derive its blood supply. 
While the general type of cerebral cortex prevails in the por- 
tions transplanted, certain differences from normal cortex can 
be detected. Such areas have a slightly different reaction to 
staining agents than have surrounding areas. The colors vary 
slightly in intensity and in shade from those of the rest of the 
section. After fixation and staining the neurons appear some- 
