68 . NAOKI SUGITA 
fresh condition of the material was made in the same manner 
as for the sagittal cortex, by multiplying by the square of the 
value of the correction-coefficient. This latter was obtained 
by the formula given in a former paper (Sugita, ’17 a), as follows: 
The diameter W. D in fresh cerebrum 
The diameter W.D on the slide 
Correction-¢oeffiicient = 
mm.2 
75 == 1 | ] 
| sae 
65+ | a J | sues | 
: yas 
a lee nea 
55 1 = lee | | 
50 Won iSes eras 
LAE wi | 
45) =, 4 Baie | 
poe ] | 
| aa | | 
E 
| »| | 
| | ions a eae | 
| Rieeae in 
2 eae ee | : 7 : = 
5} ] at Se + lee eee | 
| | sae | | ; 
A = 
“a | me iin Sete = =f 
| | Pat } Bee : 
| be pee Lae | | | | | | | 
Ss | Ls | | 
he |_ 7 ) | 
; i | | | 
an | ba 2a = aa aes) | cae —= a 
SE | | 
| ¥ = | | | 
A Be coal: sol jes | | 
/ | | | | | | | | | | 
| ; | | | | | 
| 
| {ese | | | | 
0 Of 02 03 04 05 06 O7 08 O9 10 ff, 12 13 4 15 16 47 18 19 20 gns 
Chart 1 Showing the corrected areas of the cerebral cortex in the sagittal 
and the frontal sections and the area of the whole frontal section, all according 
to the brain weight, accompanied by the theoretical value of the last which is 
assumed to be proportional to the square of the cube root of the brain weight. 
Albino rat. X—.—.—- X, Cortical area in the sagittal section. © oof 
Cortical area in the frontal section. ° ef, Area of the whole frontal section. 
-------- T, Theoretical area of the frontal section, i.e., the square of the 
cube root of the brain weight. All graphs are based on the data in tables 1 
and 2. 
These data are all entered in table 2, in which the average 
measurements for each brain weight group are also given. The 
graphs for the total area of the frontal section (graph F) and 
for the area of the frontal cortex (graph f) in chart 1 are based 
on the corrected data given in table 2. 
