TABLE 2—Concluded 
GROUP 
XVIII ¢ 
BRAIN 
WEIGHT 
OBSERVED 
CORRECTI 
ON- 
COEFFICIENT 
CORRECTED 
PERCENT- 
AGE OF 
CORTICAL 
Area of W.D.« Nreaiof |p eern 
ofeortex | total | imfresh |“crsitde | of cortex | £02! | sncnow 
grams mm 2 mm. mm. mm. mm.? mm 2 per cent 
1.412 | 13.9 29.4 13.65 | 10.30 | 24.4 51.6 47 
1.441 | 12.4 25.7 13.10 9.20 | 25.2 51.0 49 
1.483 | 15.2 33.3 13.80 | 10.80 | 24.8 54.4 46 
1.445 13.8 29.5 1.387 24.8 62.3 47 
1.530 | 14.4 33.6 13.80 | 10.80) 23.5 54.8 43 
1.542 | 13.9 30.5 13.70 | 10.40 | 24.2 53.0 46 
1.552 |} 14.2 31.7 13.50 | 10.30 | 24.4 54.4 45 
1.573 | 14.2 30.8 13.90 | 10.60 | 24.4 53.1 46 
1.574 | 14.8 32.2 13.70 | 10.50 | 25.2 54.8 46 
1.554 | 14.8 31.8 1.30? 24.8 54.0 46 
1.642 | 16.4 37.0 13.80 | 11.20 | 24.9 56.2 44 
1.643 | 11.6 27.4 13.40 9.50 | 23.2 54.7 42 
1.647 | 14.3 29.8 14.00 | 10.50) 25.5 53.2 48 
1.690 | 13.0 30.7 13.45 10.00 | 23.5 55.3 42 
G56) 1828 | 181-2 1.332 OE 3 | 54.9 4h 
1720) | 1259 28.7 13.50 9.60 | 24.8 56.8 44 
1.721 | 14.8 34.5 14.00 | 11.00} 24.0 56.0 43 
PefsOn| Lib 40.4 14.70 | 12.385 | 24.8 57.2 43 
Wo Gel |) I/o® 39.2 14.40 | 12.10] 24.8 55.6 45 
127261) 15.6" |" 85.7 1.262 24.6 | 56.4 4h 
ISS lass 31.1 14.00 | 10.10} 25.6 59.8 43 
1.844 | 17.4 38.1 15.00 | 12.10 | 26.7 58.5 46 
1.855 | 14.2 32.0 14.30 | 10.60] 25.8 58.3 44 
1.839 15.0 83.7 1.32? 26.0 58.9 44 
1.924 | 14.8 33.9 14.10 | 10.90} 24.8 57.0 44 
1.924 | 14.8 83.9 1.292 24.8 67.0 4h 
POST 1Gr 8 4207. ARSON 127100) 25.2 63.9 39 
ZROGQE Mond 40.3 14.60 | 11.70} 24.5 62.8 39 
2.054 | 16.8 41.6 1 oer 24.9 63.4 39 
C. Number of nerve cells 
On the frontal sections used for the measurement of the cor- 
tical area, the number of nerve cells contained in a unit volume 
at a fixed locality in the cortex was counted. The locality 
selected was at the middle part of the cortical band (fig. 2, VII), 
designated as locality VII in figure 4 in a former paper (Sugita, 
71 
