48o 
THE ANTIQUITY OF MAN 
vertical line, a little above the supra-orbital ridges. The 
minimum width of the forehead was 98 mm. In fig., 
178 the reconstructions of the Piltdown and test skulls 
are compared. In the fossil skull the temporal lines are 
wider apart than in the test skull, the minimum frontal 
width of the former being between 100 and 105 mm. 
The forehead represents the anterior wall of the brain 
chamber, and the reader may naturally infer that with 
Fig. 176.— Reconstruction of the face of Eoanthropus as seen in profile. 
a wide forehead the frontal lobes of the brain of 
Eoanthropus must also have been above the average 
width. We must take into account the thickness of the 
frontal bone ; with a thick frontal bone, such as that of the 
Piltdown skull, the temporal lines are necessarily more 
widely separated than in a modern thin-walled skull. 
If the frontal views of the skull reproduced in fig. 177 
be examined, it will be seen that the temporal lines, as 
they ascend the forehead, soon pass outside the 50-mm. 
lines, and at the point where they cross the coronal 
