BRAINS OF EUROPEAN AND AMERICAN RATS COMPARED  S8I1 
TABLE 12 
Giving for each body weight group of Mus norvegicus the mean values for all the indi- 
viduals from each of the four stations. Below each weight group is also given the 
mean for the European series alone. 
Records from Philadelphia = A; Paris = P; London = L; Vienna = V 
NUMBER OF 
CASES BY SEX = | | MEAN 
WEIGHT GROUP coal | Cseceam aaa | coe 
M. || °F: | 
grams mm. | cc. 
A 0 1 74.9 157 I SCKD) 
iy de 1 2 19.3 142 1 G83 
1 t=3100,0)- 25 Oi ker eee eee lees A 87.8 156 1509 
[ore I) 8 4 80.6 | 148" 7) Sie 567 
Mean of European series.........| .. Senor 82.5 149 1.536 
Agial) g2snedie |) 128-2." |) 170m ainingas 
P 10 MEO SiG Mealy |) ales 
TIDY 1 U5 OES fo ter ater eer eer are ore cena L Sl ae 196 1 179 1.653 
WU 4 |) 5 126.0 178 | 1.694 
Mean of European series.........|...... eae Bree cscs 127.4 178 1.714 
ASP 5) | SE aetOro 9 |) - 194°. |) 12. 897 
Ls janie 122 3 10°) 173.8 | 195 | 1.894 
PION ce ate sams re ae oe 
Cl Vee Sin 20m aia. |) 103 1.788 
Mean of Huropeanseries.........)......|...... pera 174.1 | 196 1.860 
(} A 11 6 2,226.2 214 | 2.000 
TLS eee er | eh eee ee?) «| 2002 
L 14 8 224.7 | 214 1.980 
V OW esl4 es 223608 4 21a 1.936 
MeamonBunepedn series: ...1hs.0|...2-|2 28 oa eee 223.4 211 1.972 
A 5 8 28279) {| 225 PAB 
SIS EO Tae ee te a a een P| 5 | 10 | 277.8 | 224 | 2.129 
L 12 13 272.3 224 2.053 
V 8 en | DOs. 221 1.978 
Meaniof Huropean series... «2. <2 ..|a1.se\aaeeee nea. _ 270.6 223 2.053 
| RS eden is | S266 2! 1 237° | 2! 210 
TCS ee ee, ee P | 7 | 5 | 322.2 | 234 | 2.205 
L 8 5 320.7 | 234 2.090 
V 2 A 22:00) || 250 2.154 
Mean of Hurapesn Series.:).. 5 <. slaeeeelies ve line ee ok | 321.9 234 | 2.149 
ee 13 2 BME 0 ZAG) | 2.285 
SAN 0, 5 i oe ae | P 3 3 377.6 238” Aes 
eels 3 1 Sy) 3) 246 2.318 
a's 4 ie SCR 245 2 225 
Mean of Kuropeanseries. ..... 022 |fcs, <:\o0. ee. Roe eee: 377.0 243 | 2.264 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 22, No. 1 
