576 ELIZABETH HOPKINS DUNN 
open space and formed a band along the margin. It appeared 
that the massing was more noticeable when the margin of the 
opening was near the center of the antero-posterior diameter of 
the hemisphere than when it was near the frontal or occipital 
Fig. 3. Showing margin of wound with a massing (M/) of cortical fibers. 
These fibers can be traced in successive sections, to the surrounding margin of 
the open space produced by the ablation. Zeiss microscope, camera lucida. 
Outline on table level with Ocular 2, Objective 16.0 mm. 
pole of the hemisphere and that this was correlated with the 
marked inerease in the number of such fibers in the corre- 
sponding region. It seemed possible then to interpret these fibers 
as association fibers because they could be found at various 
