DIFFICULTIES OF RECONSTRUCTION 341 
which indicates the middle line — the junction of the 
right and left halves — is very apparent ; it lies between 
the attachment of the muscles of the right and left sides 
of the neck, the sides of the neck being always of 
nearly equal size. The right and left halves of the 
occipital, which lie above the neck, always show, in 
modern skulls, a certain degree of dissimilarity or 
asymmetry. As a rule, the larger the brain and skull 
the greater the degree of asymmetry. 
To bring out this feature of the occipital bone, I 
have been in the habit of representing the hinder view 
of the skull within such a framework of lines as is shown 
in fig. 117. It is within such a framework that we must 
build up and form our knowledge of this newly dis- 
covered extinct form of man. There are three vertical 
lines — the mid-line, and the right and left lateral lines 
drawn parallel to the mid-line at a distance of 2 inches 
(50 mm.) from it. The two lateral lines which form 
the sides of the frame are 80 mm. from the mid-line. 
A skull wide enough to fill the space between these 
extreme lines would have a width of 180 mm. (7 inches), 
that being a very wide skull. Another line is important 
— the horizontal or zero line, which crosses the hinder 
and lower angles of the right and left parietal bones. 
Above that line lies the chamber for the cerebrum — the 
active organ of mind ; below it the chamber for the 
cerebellum. Along or just below this line, on the inner 
aspect of the occipital bone and in the marginal space 
between the cerebrum above and cerebellum below, lie 
the great lateral blood-sinuses (fig. 117). The right 
sinus is usually a continuation of another great blood- 
sinus which passes along the roof of the skull, under the 
mid-line. Of the other two horizontal lines which 
bound the framework for the skull, one is placed 50 mm, 
(2 inches) below the chief or zero line, the other 
100 mm. above it. A skull which reaches both the 
upper and the lower horizontal lines would have a 
height of 150 mm. (6 inches) — that is, a skull of rather 
more than average height for Englishmen (fig. 1 1 7). 
