THE BRAIN OF FOSSIL MAN 
419 
tion of the right hand and right side of the body. The 
man who chipped the eoliths which lay beside the skull in 
the Piltdown gravel evidently had reached a high degree 
of right-handedness. While investigating the peculiar 
preponderance of the left occipital pole in modern skulls, 
I was struck by the fact that it is accompanied by a 
corresponding asymmetry in the lambdoid suture. On 
Fn;. 153. — An occipital view of the original brain cast of the Piltdown skull. On 
the right side the stippled line indicates the degree of expansion required to 
make the right hemisphere of the brain symmetrical with the left. 
the left side the lambdoid suture in such skulls crosses 
the 50-mm. line higher up and passes further beyond it 
than on the right side. I mention this fact because in 
the reconstructions of the Piltdown fragments shown in 
figs. 153 and 154 the condition of the lambdoid suture 
is reversed. In fig. 154 the left occipital lobe of the 
brain is given its just preponderance, and the left half of 
the occipital bone has been made more extensive than the 
right. In the development of the occipital poles, then, 
