GROWTH OF THE CEREBRAL CORTEX 201 
TABLE 7—Continued 
SAGITTAL SECTION FRONTAL SECTION 
| lavE RAGE| Percent- 
SERIES, LITTER AND TEST 
, é : BRAIN eee r age of 
SROUE CONTROL | WRIGHT HOC Area of Comer Area of aes cortical 
efficient | “TX | efficient | Cortex section fe ae 
area 
| grams mm 2 mm. mm. per cent 
Series ITT | 
G asg ral: 0.844 1.14 20.1 1.24 19.2 38.5 50 
h-} es | ASA: 1.19 25.6 1.26 22.9 46.2 50 
Average | Als (ose) pala 18-6 | 1-20) 17.30) 35:2") 49 
(Ser. LeIaW Off ADS ARE aaa Oy 1.20) 24.5 1.29 | 22.6) 45.0 50 
Average | Cuil ZOOL Peon =athe7 | 1205) 15s") S319 48 
(Ser. I) f Coy 2260) eS) 260 | 1.244 99.04! 45.011)» 249 
| | 
The above-mentioned corrected data for each individual were 
separately paired with the corresponding standard values for the 
same brain weight, quoted from my previous study (Sugita, ’18 b) 
in table 8 a (unpublished) and from this latter table 8 was con- 
densed, giving only the averages for each group. 
Briefly stated, the area of the cortex in the sagittal section of 
the underfed is on the average greater by 1.4 per cent (average 
of all eight litters, T. groups only) than in the standard, while 
the controls are on the average about 1.9 per cent less than the 
standard. 
The average area of the total frontal section is in the underfed 
ereater than that of the standard by 2.4 per cent (average of all 
eight litters, T. groups only), while the controls are less by 3.8 
per cent (average of Litters A to E, C. groups only) than the 
standard, and the area of the cortex in the frontal section is in the. 
underfed greater on the average by 5.0 per cent, while in the con- 
trols less by 2.1 per cent, than the standard (table 8). From 
these observations, it may be easily concluded that in the under- 
fed the proportion of the cortex to the total section is higher than 
in the standard or control, as shown by the percentage values 
directly calculated for each brain (table 7 b) and given in a con- 
densed form in the last column of table 7, where the values are 
