550 



NAOKI SUGITA 



The results are condensed in table 5, where the average thick- 

 ness for the sections in each plane is given and also the general 

 average for the three sections is combined, the arrangement of 

 the data being according to brain weight groups. 



Chart 1 repeats in graphic form the data in table 5. 



TABLE 5 



Showing the general average thickness of the cerebral cortex of the albino ral according 

 to brain weight groups, also the average thickness in the sagittal, the frontal and 

 the horizontal sections 



The methods used in making the measurements have been 

 described already. In applying these methods, from 2 to 12 

 measurements were made in each locality of each brain and the 

 average of these recorded as the observed value. These data 

 for each locality, in each brain of a brain weight group, were 

 then averaged and the value obtained taken as that for the 



