Fig. 6 Diagram of the sagittal section, from the albino rat brain weighing 

 1.5 grams, at about 30 days in age, showing the cell-lamination of the cortex and 

 the localities at which the thickness of the cortex was measured. //' is the 

 level from which the frontal section was to be taken. Lines AA', BB', CC, 

 DD', EE' and FF' indicate the borders of the areas showing different types of 

 cell-lamination. 



Fig. 7 Diagram of the frontal section, from the albino rat brain weighing 

 1.5 grams, at about 30 days in age, showing the cell-lamination of the cortex and 

 the localities at which the thickness of the cortex was measured, ss', plane 

 in which the sagittal section was taken; hh', level from which the horizontal 

 section was taken. Lines GG', HH', KK', LL', MM', NN' and 00' indicate the 

 borders of the areas showing different types of cell-lamination. A'^' fissura 

 rhinalis. Between M and N the claustrum — {CI} — is seen. Gr.' marks the 

 unidentified cell group between A'^A'"' and 00'. 



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