THE BRAIN OF FOSSIL MAN 
409 
temporal lobe, which is separated by the stem of the 
fissure of Sylvius from the inferior frontal convolution. 
We have two reasons for taking our survey of the 
brain in this order : (i) because part of the first temporal 
convolution is directly concerned with the sense of 
hearing, and in the interpretation of sounds and words ; 
(2) because we here meet with one of the chief dis- 
. 148. — Profile drawing of the original cast of the Piltdown brain. The 
missing parts are stippled and the positions of the suture lines are indicated. 
To facilitate comparison with other brains, the drawing is set within a 
standard frame of lines. 
crepancies between Dr Smith Woodward's and the 
writer's reconstruction of the Piltdown skull and brain 
cast. In the Gibraltar brain cast, perhaps the most 
primitive representation of the human brain as yet found 
in fossil man, one clearly recognises the three temporal 
convolutions — the first, second, and third (fig. 150). 
In the gorilla brain cast they are also apparent : the 
third or lowest is small and but slightly represented on the 
