GROWTH OF THE CEREBRAL CORTEX 159 
Diameter in micra 
40/— 
334 
36 
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Chart 4\!Showing a comparison of sizes of the cell bodies and of the nuclei 
of the ganglion cells in the lamina ganglionaris and of the pyramids in the lamina 
pyramidalis in brains of the Norway and the Albino, according to age. The 
Norway brain weight was reduced by 18 per cent and entered at the correspond- 
ing brain weight of the Albino. The data were taken from tables 3 and 7. The 
chart has been divided and the values 22-26 on the ordinate repeated to prevent 
confusion among the graphs for the cell bodies of the pyramids, PC and PC’, 
and the graphs for the nuclei of the ganglion cells, GN and GN’. In the upper 
chart: Graph GC’, cell body of the ganglion cells in the Norway. Graph GC, 
cell body of the ganglion cells in the Albino. Graph GN’, nucleus of the ganglion 
cells in the Norway. Graph GN, nucleus of the ganglion cells in the Albino. 
In‘the lower chart: Graph PC’, cell body of the pyramids in the Norway. Graph 
PC, cell body of the pyramids in the Albino. Graph PN’, nucleus of the pyra- 
mids in the Norway. Graph PN, nucleus of the pyramids in the Albino. 
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