CEREBRAL CORTEX: WILD NORWAY 



365 



(a) Comparison with Albino. Although the values given in 

 columns Gaud H, table 197 are relative, they show how the volume 

 of the cortex increases with brain weight in each strain, and the 



TABLE 197 



Showing the computed volume for the entire cerebral cortex of the Norway rat brain, 

 calculated by the formula: L.F. X W. D X T X C for each brain weight group, 

 C being a fixed coefficient used to convert the computed volume of the Norway 

 cortex so as to make it comparable with that of the Albino (C = 1.038). The 

 computed volume of the cerebrum is quoted from my previous presentation (Sugita, 

 '18). These values are paired with the corresponding values for the cortical volume 

 of the Albino and the ratios between them calculated 



*T, here entered, is the mean value of T 8 and T r , previously given in tables 

 11 and 13 and is not the general average thickness of the cortex of the sagittal, 

 frontal and horizontal sections formerly presented in my fourth paper in this 

 series (Sugita, '18 a). 



relation between the volume in the Norway and in the Albino at 

 like brain weights. As a result of the greater thickness and area 

 of the Norway cortex the volume exceeds that of the Albino by 

 about 7 per cent. 



