36 NAOKI SUGITA 
TABLE 10 
Giving the weight of the dry substances in the brain of the Norway rat according to 
brain weight. Based on the observed data given by Donaldson and Hatai (’11), 
in p. 448, Jour. Comp. Neur., vol. 21. Both sexes averaged. *Males only. 
WEIGHT OF THE WEIGHT OF THE 
TOTAL BRAIN WEIGHT DRY SUBSTANCES IN TOTAL BRAIN WEIGHT DRY SUBSTANCES IN 
THE BRAIN THE BRAIN 
grams grams grams grams 
0.25 0.041 1.55 0.309 
0.35 1.65 0.339 
0.45 165 0.377 
0.55 1.85 0.400 
0.65 0.067* 1.95 0.407 
0.75 0.100 2.05 0.445 
0.85 0.100 2.15 0.460 
0.95 2.25 0.498 
1.05 2.35 0.500 
1.15 0.155 2.45 0.540 
1.25 0.210 2.55 0.534 
1.35 0.229 2.65 0.575 
1.45 0.291 2.75 0.600* 
03 
a2 
a4 1 
T ; ++ + 
0 a2 04 a6 08 10 12 4 16 18 20 22 24 26 28 gms 
Chart 10 Giving the absolute weights of the dry substance in the! N orway 
brain, arranged according to brain weight, based on the observations of Donald- 
son. and Hatai (’11), accompanied by the corresponding data for the albino rat, 
in a dotted line. ™* and * show the turning points of the curves. 
