K. Pearson 123 
/oo 
mo 
170 
J30 
JZO 
; 
1 
1 
1 
1 
1 
; 
1 
1 
1 
1 
1 ^ "j/-'^ 
' HEAD LENGTH 
4 
1 
1 
1 
1 
1 
Mean 
<l 
Mean 
Z 1 
< 1 
X 1 
2 ' 
< 1 
LI 1 
z ' 
< 1 
UJ 1 
Y < 

Group 
Group 
1 
tt. ' 
31 
°1 
k' 
Oi 
1 
(L 1 
3 ' 
O 1 
C 1 
a 1 
Group 
d . 
3 
0 1 
C 1 
o , 
1 
1 
1 
» ' — 
1 
— 
HEAO BREA.OTH 
V — 
— r' 
1 
1 
1 
1 
\C.i'rla 
! 
1 
'~~r''' 
1 
T 
AURICULAR HEIGHT 
? 
1 — ' 
— \ — 
1 
1 
1 
1 
VERY 
DULL 
SLOW 
DULL 
SLOW 
SLOW 
INTELLIGENT 
INTEL LIOrwT 
quick INTELLIGENT 
Fig. 6. 
16—2 
