GROWTH OF THE CEREBRAL CORTEX 155 
TABLE 8—Continued 
LAMINA PYRAMIDALIS LAMINA GANGLIONARIS 
BRAIN WEIGHT BRAIN CORRECTION- 
CUAOIHE RGEC COE CEB NE at Gellibody: Nucleus Cell body Nucleus 
diameter diameter diameter diameter 
grams BL BL B BL 
FN XxXI 9) Me 1.39 23.5 19.2 39.6 28.1 
HN XXI 2.156 1.34 23050 18.9 34.8 26.0 
2.164 23.5 19.1 lane, Dial 
FN XXIII 2.345 1.26 22.0 Lae 37.8 24.6 
HN XXIII 2.345 1.28 22.6 17.4 36.8 24.1 
2.3846 22.3 HPht) EN) 24.4} 
1See note on table 6. 
Chart 2 shows for the Norway also that the ganglion cells are 
enlarging slowly but steadily throughout life, while the pyramids 
rather decrease in size slightly in later life, after having attained 
the maximum size in brains weighing 1.3 to 1.5 grams. So, in 
the Norway as in the case of the Albino, the pyramidal cells in 
the lamina pyramidalis undergo some diminution in the adult 
brain. 
Chart 3 gives a comparison of the cell sizes in brains of like 
weight in the two forms. In Group N XI, the sizes of the cell 
body and the nucleus of the pyramids are slightly smaller in the 
Norway than in the Albino. This is probably explicable by the 
fact that the Norway brain at this stage is still immature and 
younger than the Albino brain of like weight. Such a relation 
has been revealed in other measurements also; for example, in 
the cortical thickness, the cortical area, etc. (Sugita, 7°17 a, 
18 b). The ganglion cells in the Norway are larger than in the 
Albino and the difference in the size of the ganglion cells in the 
two forms increases somewhat as the brain weight advances. 
In Groups above N XIII, the cell size (pyramidal and ganglion 
cells) in the Norway proved to be generally larger than that in 
the Albino of the same brain weight. 
The summary in table 9 gives the average diameters for the 
adult Albino (Groups XIII to XX) and the adult Norway 
(Groups N XIII to N XX). 
