LoZ NAOKI SUGITA 
TABLE 6 
Giving the average wncorrected diameters of the nerve cells and their nuclei in the 
lamina pyramidalis and the lamina gangvionaris measured at the fixed locality 
(locality VII) on the frontal sections of the Norway rat brain. The data are given 
for each brain weight group only. This table is comparable with table 1 
LAMINA PYRAMIDALIS LAMINA GANGLIONARIS 
BRAIN WEIGHT | NO. OF | BRAIN Cell body Nucleus Cell body Nucleus 
GROUP CASES |WEIGHT diameter diameter diameter diameter 
Transv.| Longit. Transv.| Dongil eramee Longit.)|Transv.| Longit. 
| grams Mh KM 3 | M in K M 7 
N XI 3 1164) 15325) 20-8) |) 1405") 155) 2025. | 2920") TSE i Loks 
N XIII 1 1.369] 15.5 | 20.9 | 14.4. )°15-:5 || 20.6 | 29:9) | 18.3) | 2052 
N XIV 6 1.430) 19.4 | 20.6 | 14.2 | 15.1 | 21.6 | 29.6 | 18.4 | 19.4 
N XV 3 1.546) 14.8 | 19-8) 13-8 | oT 2025 |) 28-9) | 17.8) | T9k6 
N XVI 3 1.629) 14.6 || 19-8 |) 13.4) 14.1 | 21.2) 29.0!) 17-8) 19e2 
N XVII 4 1-739) 1479 | 20.4 |) #3.3 |) 14% |) 219) | 29:8) | 18.9) |) 2022 
N XVIII 2 | 1 S29 aS ON 20 | 14 WS =) Doan S28) ZO nea leelene 
N XIX Dy 12972 (4S) 1924 | SR On Aron eae om ao( | 20cm moieno 
N XX 2 2.052] 14.5 | 19.8 | 13.6 | 14.3 | 23.9 | 33.2 QS e2aG 
N XXI 2, DE WiZ ASSN ZOL OM 13hor hae SOS RON 4s On lO RA eae 
N XXIII 1 |S 25345 ASG) QO a3 335) 132902570) Ps6n0n 1S s5e E20 Rs 
1Tn this group the size of the nucleus of the ganglion cells has fallen down 
remarkably (see also chart 2), which fact was not seen in the Albino (Group 
XX). Whether this is due to an actual change in old age or due to incidental 
variation cannot be definitely affirmed here. 
termined that in both forms the total number of the nerve cells 
in the cerebral cortex is practically the same, it becomes desir- 
able to compare the size of the nerve cells in the two animals in 
order to test the assumption of the above authors. 
The material used in. this study comprised 54 Norway rats, 
sexes combined, the data for which are given in tables 1 and 2 
in a former paper (Sugita, 718 a) and which are the same ma- 
terial that was formerly employed for the other measurements 
on the cortex. It seems unnecessary to repeat these tables 
here. . 
In the selection of the localities in which the largest cells in the 
lamina pyramidalis and the lamina ganglionaris were measured 
and in making the measurements, the same procedure was fol- 
lowed as has been described minutely for the albino rat in part 
I of this paper. 
