Journal of Comparative Neurology and Psychology, 



Gms. 



Vol. XVIII, Plat* III. 



BRAIN WEIGHT 



BODY WEIGHT 



Gms. 20 40 



MAN 



Gms. 



1 3 



140 160 180 



Chart J. 



MAN AGE YEARS 

 11 13 15 



220 240 260 280 300 320 



17 



19 



21 



23 



25 



RAT 

 Gms 



2.00 



1.50 



1.00 



.50 



.00 



MALE 



FEMALE 



BRAIN WEIGHT 



10 30 50 70 90 110 



130 150 170 

 RAT AGE DAYS 



Chart i;. 



190 210 230 250 270 290 



