TRANSPLANTATION OF CEREBRAL CORTEX a7 
levels in the cortex, could not be traced to projection fibers, 
and extended some distance through the cortex. Fibers of 
this kind can be found at M in figures 3 and 4 and in figures 
5 and 6. 
Fig. 4 Detail of figure 3. Showing the upper part of figure 3. Some small 
neurons (V) may be seen among the massed fibers. Zeiss microscope, camera 
lucida, outline on table level with Ocular 2, Objective 8.0 mm. 
The more recent work of Greenman, 716, suggests a satis- 
factory interpretation of the number of medullated nerve fibers 
found circling the gap in the cortex. Dr. Greenman found in 
studies on the regeneration of peripheral nerves that the num- 
ber of nerve fibers on the proximal side of the lesion in the re- 
generating nerve was enormously increased over the normal. 
