EOANTHROPUS DAWSONI 
319 
lOV 
line of the head and of the neck is preserved (fig. 102). 
We therefore know the width of the right half of the 
occipital bone, and we may be certain the left half was 
almost exactly of the same size. Hence in the drawing 
of the recovered fragments the right half of the occipital 
bone is represented as if it were on the left side, in place 
of the right (fig. 100). 
The frontal, parietal, and occipital bones form the front, 
roof, and hinder part of the brain chamber. The 
temporal bone, 
which helps to ^v^- 50 ^a -^ —T- - ^^^ ^° ^^1 
complete the 
lateral wall of the 
chamber, also 
forms part of the 
floor or base of 
the cranial cavity. 
Almost the whole 
of this bone was 
found — of the 
left side (fig. 100). 
A fragment is 
missing, but suffi- 
cient of its upper 
border is pre- 
served to give us 
its true relation- 
ship to the parietal 
bone. As may be seen in fig. 100, a mutual point of 
contact is present on the opposing margins of the tem- 
poral and parietal bones. It will thus be seen that all the 
essential components of the brain chamber are present ; 
there are sufficient parts to form almost a complete half 
of the brain chamber. In the case of the skull a half 
is almost as good as a whole, for the left and right halves 
of every head are approximately similar. 
All of these fragments of the Piltdown skull are, at 
first sight, very similar to the same parts of a modern 
human skull except as regards their thickness. The 
PILTDOWN RECONST RUCTION 
The fragments of the Piltdown skull viewed 
from behind. 
