THE BRAIN OF FOSSIL MAN 
415 
it thus comes about that the right half of the body is 
more directly connected with the left hemisphere of the 
brain, and vice versa. I have never seen a human brain 
in which the convolutionary pattern of both sides was 
alike. In the human brain there is evidently some 
degree of specialisation in its two hemispheres. At the 
Fic. 151. — The occipital aspect of the brain cast from the skull of a young gorilla, 
to show the slight degree of asymmetry of the left and right sides. The 
drawing has been set within the standard lines used for the human brain, 
so as to give a true comparison as regards size of the anthropoid and human 
brain. 
present time we regard perfect symmetry of the two 
hemispheres of the brain as indicative of a similarity in 
function ; a high degree of asymmetry, if not due to a 
disturbance of normal growth, betokens a specialisation 
of function. An asymmetrical brain, then, is a specialised 
brain, the opposite to the primitive symmetrical brain. 
In fig. I 5 I is represented the occipital or hinder aspect 
of a o-orilla's brain cast. The rioht and left sides are 
