254. NAOKI SUGITA 
Donaldson (’91) measured also the thickness of the cerebral 
cortex at fourteen. localities from each hemisphere of nine nor- 
mal brains (six males and three females), as shown in figure 3 
reproduced from his original paper, in order to obtain control 
A 
Fig. 3. This figure shows the localities on the hemispheres from which the 
samples of cortex were taken by Donaldson (91). Kor the thickness of cortex 
at each locality see table 8 and chart 2. A = Lateral aspect. 3 is used to desig- 
nate the insula, here not exposed. B = Ventral aspect; C = Mesial aspect. 
values for the study of the brain of a blind deaf-mute, Laura 
Bridgeman. The technique employed by Donaldson was fixa- 
tion in bichromate and alcohol (potassium bichromate 23 per 
cent plus % its volume of 95 per cent alcohol) for six to eight 
