NERVOUS SYSTEM 



85 



In column D of table 48 the numbers entered are only one 

 fifty thousandth of the computed numbers. Hence, after wean- 

 ing, there are, according to this calculation, 530 X 50,000 or 26.5 

 million cells in these two layers of the cerebral cortex. 



Growth in the diameters of cortical cells and their nuclei (Sugita, 

 '18 c). At the two localities shown in fig. 10 (a and b) the 

 diameters of the largest cells and their nuclei in the lamina 



<M Q2 03 04 Q5 Q6 Q7 Q8 09 10 11 12 13 14 15 16 17 18 19 20 



Chart 9 Giving the corrected thickness of the cerebral cortex in sagittal, 



frontal and horizontal sections and the general average thickness of the cortex 



for the three sections combined, on brain weight groups. Based on table 47. 



S. Average thickness of the cortex in sagittal section. Corrected. 



-F. Average thickness of the cortex in frontal section. Corrected. 



H. Average thickness of the cortex in horizontal section. Corrected. 



A. General average thickness of the cortex for all three sections. 

 Corrected. 



pyramidalis and the lamina ganglionaris were measured, in 

 material fixed in Bouin's fluid. The ten largest cells and their 

 nuclei in each locality were measured on two diameters. The 

 mean diameter was determined as the square root of the prod- 

 uct of the two diameters. As in all the other measurements 

 made on the cortex, the direct observations were corrected for 

 the effect of the treatment so that the values here given apply 

 to the cells in the fresh state. 



