Ranson, f2bers in Lesions of the Brain. 207 
made onasmall scale because the scar was too wide to be included with 
the surrounding tissue in a high power tracing. The alveus (a) is normal. The 
corpus callosum (¢.c.) is unstained, with the exception of a few fibers. The 
arrow indicates the path of the knife and ‘‘f”’ designates a fiber apparently 
crossing the scar. 
fig. 8. Camera lucida tracing of a small area of scar in another section 
from the same brain (Rat No. 4) as that represented In Fig. 4. 
fig. 9. Drawing of the aggregation of fibers in the scar in the ventral 
part of the cortex (Rat No. 2) shown in Fig. 2. Notice the masses of blood 
pigment (4) along the line of the wound indicated by the arrow. Many fibers 
run downward along the scar, some of which cross the line of the incision at *f’’. 
fig. 10. Drawing from a frontal section of the left cerebral hemisphere 
of arat operated on at the age of 4 days and killed 32 days later. The cortex 
was fixed in VAN GEHUCHTEN’S solution, imbedded in paraffin, cut in sections 
6 thick, and stained in erythrosin and toluidin blue. The path of the knife 
is indicated by ‘‘c’’. Notice the absence of connective tissue cells, and the 
presence of nerve cells bordering directly on the line of the incision. 
