PARTS OF BRAIN 
IN NORMAL AND 
TABLE 1 
UNDERFED RATS 
513 
Number and sex of rats, body weight and length, and weight of the brain with the 
percentage weights of its various subdivisions in normal rats at various ages 
Oe CC eC a a a a 
nse 
Qy 
diately measured in the usual manner. 
NUMBER, SEX, AND AGE 
OF RATS 
o', 4 9, Newborn 
OPN GAN Siscesereray cera: 
OE RANOAVISR cme e ts ccc 
OROAdaVS: «crac ees 
GiORG ay, San sere eer 
ils I Cie ts) CSE oe oe 
Hp Oe) Clini panleok 
Cee Or 10 davseek ss: « 
Oreliliday sry. ere ts 
Cpl? CaS nae 
OFA aay Si peee co cee 
Sil pO 5 PALS. CONT on ae 
GS) OAS OU NIETS m Glee nicola 
OGIO Wichac ae eo bear 
iy) 22), 42:6) daiys. o... 
oO, 2) 9), 49:6 days... . 
Gil, OBC o o.b:6.0 ota piers 
Ct 0) Gays.2.5: 
cle Ora ays ac 
Cle Ore 2 adaysn..: 
Ceecmern4ordaysenns: 
> 
’ 
GROSS 
BODY 
WEIGHT 
164. 
{ & 357 days..|c7257. 
| 9 454 days..| 9213. 
BODY 
LENGTH 
mS & ot or 
ee Shee 
Nears) KS) 
=> 
for) 
wo orm Ww wy 
o> 
oon 
86.08 
97.0 
105.0 
126.3 
115.6 
141.0 
149.04 
176.0 
169.5 
182.5 
0212.0 
O19 G0 
PER CENT PER CENT|? 2% CENT 
BRAIN. ae fee Hs ars 
WEIGHT | cERE- eae CEREBEL- gee? 
BRUM LUM heh 
grams 
0.2086} 64.4] 29.3 3.65 Deol 
0.2640! 62.4|] 30.38] 4.28 3n12 
0.3545} 67.6 PATO) | Wee! iL .aitl 
0.4400} 68.6 22.5 0.43 | 3.47 
OP5135), 694) 92224286 Pe (6 
0.6259} 71.7 18.8 (0},:1395) 2.93 
0.6969} 71.4 19.1 Orde |an Ls 
0.6699} 71.2 IRS3FS)! ||| 8 saR 2.65 
0.7451} 70.1 18.7 8.06 | 3.14 
0.6838] 70.9 19.3 7.01 2.79 
0.9994) 69.2 6 Ose 3.04 
1.2800) 67.1 1622) 258 3.69 
1.2087} 65.1 LGRGM S25 4.47 
1.3500} 65.0 HGeg 1133. 7 4.33 
1.4889} 64.3 ff} || 1133. 4.83 
12 2026/2 63a 1883 | 1433 4.15 
1.5856} 63.7 Wes a 14a 4.62 
1.5962} 63.6 18.0 | 13.9 4.58 
1.6084, 64.4 18.8 | 13.9 2.90 
1.6839) 61.4 19.4 | 14.1 5.01 
Pa ZOLS)> "6201 203) P38 3.81 
1.8100) 60.8 21.8 | 14.6 2.92 
1 Average of 10 individuals. 
2 Average of 2 individuals. 
3 Average of 5 individuals. 
4 Average of 6 individuals. 
5 Not recorded. 
The rats were killed either by chloroform or (in a few cases) 
by bleeding. The body (nose-anus) and tail lengths were imme- 
The head was subse- 
quently severed at a point immediately behind the foramen 
magnum. The brain was then carefully removed (care being 
exercised to preserve the cerebellar paraflocculi) and weighed 
in a closed container on balances accurate to 0.1 mgm. 
