TRANSPLANTATION OF CEREBRAL CORTEX Sia 
course of the operation and had retained its vitality because of 
its ability to draw nourishment from its original blood supply. 
To illustrate the conditions found in successful transplants, 
drawings have been made from sections of the brain of Rat 2 
of Series IV, Group IV Figures 1 and 2 are drawn from sec- 
tions 119-120 of this brain. Figure 2 is a detail from the region 
Fig. 1 Showing at A a bit of transplanted cerebral cortex in the albino rat. 
From sections 119-120, Series IV, Group IV, Rat 2. X 7.5. 
marked A in figure 1. This is by chance the first true trans- 
plantation to be noticed as all the material was carried through 
before detailed studies were made upon the completed slides. 
Later in the course of reéxamination, other true transplants were 
observed. 
On the discovery of the transplant, figures 1 and 2, it was 
thought possible that it might be a portion of tissue pinched 
off from the hippocampus, to which it hes adjacent. However 
a rather wide band of cicatricial tissue could be seen in the 
double stained sections, separating the mass from the adjoining 
