TABLE 3 
GROWTH OF THE CEREBRAL CORTEX 
187 
Giving for each litter group in this study the average age, body length, tail length, 
and body weight, the last two compared with the corresponding standard measure- 
nents for the observed body length, calculated according to sex by the use of formulas 
given in ‘The Rat’ (Donaldson, ’18). 
trol groups are given at the foot of the table. 
The general averages for the test and the con- 
Ti ateSi a Ok—RCOninales 
TAIL LENGTH BODY WEIGHT 
SERIES, LITTER AND TEST * esi AVER- BODY Standard Standard 
GROUP CONTROL ORS AGE AGE| LENGTH Ob- accord- Ob- accord- 
+ served ibe te served he ae 
length length 
Series 1 days mm. mm. mm. grams grams 
A ©, By Cui To IE ah samy 334% 7 06.3) |) 260255 26n3 One ell 
h Ate ul lef 15 74.0 48.0 47 .0 13.9 13.9 
b, e, g Cr 3m 8 66.7 BLS 7 37 .0 ILS 10.2 
1 CeuL 1a 17 96.0 62.0 (lat) 30.1 26.3 
Series I 
B a, ¢, e, f Ate 3 met 9— 59.8 27.8 29.8 Tas hoe) 
1 sleeeslili 1m 19 75.0 50.0 46.0 PASE 136 
b, d (Gy I Dita 6 57.0 2580) CH es) ipl 7.0 
Ces I} rat Bot 18— 86.3 53.3 C173 20.5 2013 
Series I 
Ca,ec,d ANS IM |) Bicone aT ae 20 82.0 Died O4.503 om Hip Ai 
b,e Gy IL Dit 22— 98.5 leo) T3820 PM) 29.4 
Series I 
Da,c,d Ref ame Dat 12— 61.0 39.0 bulb 6.9 8.2 
e ‘WS MM 1m 18 78.0 | 54.0} 49.0 IBROR el o.0 
b (pt 1m 9 69.0 39.0 40.0 Ws TRO) 
f Cem 1m B22; 91.0 65.0 63.0 24.0 21.9 
Series I 
awe cacd ale Sesomee let || 2 — GOESH | coe O! || sbn8 od 9.9 
g,h at). Ju Dia 20 82.0 58.0 56.0 16.2 ae) 
e, f (CAS Miami aletal al — SON 56250) 6OTOn e216 ‘0.4 
Series II . 
F a, b Ww 1m,1f 13— 63.5 33.0 84.6 9. 9.1 
c-] A, OL Abia, Ge 25+ 83.9 61.5 Nf ol 18.1 19.4 
