566 



NAOKT SUGITA 



0.1 0.2 03 04 05 06 0.7 



Q9 10 11 12 13 14 IS 16 IT 1.8 19 20 r» 



Chart 4 Giving the average thickness of the cerebral cortex for each brain 

 weight group at localities I, II, III, IV and V in the sagittal section and the 

 average thickness for the five localities in the sagittal section, for each brain 

 weight group. Based on table 6. ■ — ■ — (above the heavy line) Cortical thickness 

 at locality I. Corrected. • — • — • (above the heavy line) Cortical thickness at 

 locality II. Corrected. Cortical thickness at locality III. Cor- 

 rected. • — • — • — (below the heavy line) Cortical thickness at locality IV. Cor- 

 rected. ■ — • — (below the heavy line). Cortical thickness at localit}' V. Corrected. 



• "S Average thickness of the cortex in the sagittal section for each brain 



weight group. Corrected. 



In each of the groups thus formed (twenty in tables 6 and 7, 

 and eighteen in table 8), there are from one to nine brains in a 

 group. In tables 6 and 7 the average is nearly four per group 

 and in table 8 it is about two and a half. 



For some groups the approximate average age is given in 

 days, but for all of the groups there has been entered the aver- 

 age brain weight, the correction-coefficient and then the cor- 

 rected thickness of the cortex at each locality in the section. 

 Finally the average thickness of the cortex for the entire section 

 is given. 



