28 NAOKI SUGITA 
28 T | T ] ] 1 
26 | | | | | 
T Saf t + = 
| | | | | | 
24 — + + 
aa elie ecck aes 
22} | It 4 2 ee ae ee ee + 
| | i | [*. |-. | 4 ; 
20 foas aes a aan alien iliaaa ‘i 
| | les | | | | 
18 = t ol : “ Jo] aS | 
| Mi) A site ‘i 
i | ieaSeateatic wt al 4 
14 | aes] 
| 4 Toot i 
a i a 
| | | | 
1.0 iP + t t eaten 
0.8|—— | Lael 
resins! | Ie | 
26 | 4 | eel ae 
el | 
04+ — mee —+ sea ltnat} = ae } 
here Selhoee se || | | 
| | | | | | 
02 ral = = SS } 
° 1 | | S| [lf | | | 1 
1 Sal ad Si SEIS SHE SIS IK) 20) Pe Prerrs 
Chart 4 Giving the corrected thickness of the cerebral cortex of the Norway 
rat in the frontal section. Individual entries for the cortical thickness at locali- 
ties VII and VIII, and the average thickness of the frontal section (localities VI, 
VII and VIII) are given. Basedon table 5. ° Cortical thickness at locality VII. 
Corrected -*< Cortical thickness at locality VIII. Corrected. * Average thick- 
ness of the frontal section. Corrected. 
mm. 
28) T ssa T —————$—_—_—_—_ 
| 
26 + 
24 
40 1 1 —t —t 
08 | 
06 | 
of a 
02 4 : + 
“G9 i213 4 15 16 17 1819 20 2f a2 gm 
Chart 5 Giving the average thickness of the cortex for each brain weight group 
at localities VI, VII and VIII in the frontal section and the average thickness at 
three localities for each brain weight group in frontal section. Based on table 5. 
-------- Cortical thickness at locality VI. Corrected. -— -— -— Cortical 
thickness at locality VII. Corrected. ——— Cortical thickness at locality VIII. 
Corrected. *——*F Average thickness of the frontal section by each brain 
weight group. 
