84 HENRY H. DONALDSON 
values for the brain weight when based on the body length (Don- 
aldson and Hatai, ’11, tables 5 and 8). It will be noted that 
the two series of results agree very well. 
BRAIN WEIGHT CHART 2. 
2 gms. 24 
oO 
2.3 STANDARD CURVE se 
NORWAY 
oO 
29 2.2 
© a 
21 eas 21 
zo STANDARD CURVE Ae 
ALBINO 
1.9 i 1.9 
18 1.8 
SPINAL CORD WEIGHT 
0.9 gms. 0.9 
© 
08 aT 08 
STANDARD CURVE 
NORWAY 
07 0.7 
0.6 STANDARD CURVE 0.6 
ALBINO 
BODY WEIGHT gms, 
0.5 0.5 
160 170 180 190 200 210 220 230 240 250 260 270 280 290 300 310 320 330 
Chart 2, brain and cord weight of Paris and of London Mus norvegicus, entered 
in relation to the respective standard curves for the Philadelphia data. For fur- 
ther control, the corresponding standard curves for the Philadelphia Albinos are 
also given on the chart. O = Paris series. O = London series. 
