THE BRAIN OF FOSSIL MAN 
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zero line in the Australian brain cast ; in the gorilla's 
brain cast the poles and sinuses are nearly on a level 
with the zero line. A low position of the occipital poles 
is a more highly evolved condition. The brain stem 
has a downward direction in the Australian, whereas its 
direction is backwards in the gorilla. The right and left 
margins of the occipital bone are nearly symmetrical. 
Fig. 152. — Brain cast from the skull of an Australian native (capacity 1450 c.c. ), 
to show the parts of the brain presented in a view from behind. 
When we view the original reconstruction of the 
Piltdown brain cast from behind we are at once impressed 
by the number of its peculiarities. On the vault of the 
cast we can note no trace of those signs which indicate 
the position and course of the longitudinal blood-sinus, 
such as are to be seen on the brain casts of anthropoids 
and men. The natural inference is that the parts of the 
bone which carried the marks of the sinus have been 
broken away and are missing. The right and left 
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