OUR FACE FROM FISH TO MAN 



jaws and large teeth (Fig. 89D). The reduction 

 in size of the tooth row as a whole seems to have 

 permitted or favored the vertical and forward 

 growth of the nose, while the opposite tendency 

 culminates in the gorilla, which has enormous teeth 

 and an extremely broad nose. Doubtless other fac- 

 tors complicate the results, for instance, the lateral 

 cartilages or alse of the nose must in themselves have 

 varying growth power, very feeble in the orang, 

 vigorous in the gorilla, still more so in man. 



The form of the nose bridge is likewise condi- 

 tioned by many factors. The greater the volume 

 of the brain in the foetus, the sharper will be the 

 bending of the brain upon itself, and the further 

 forward will be pushed the greater wings of the 

 sphenoid bone and the temporal region of the 

 skull. All this has a tendency to push the face 

 forward, especially the lateral angles of it, so that 

 in extremely wide-headed forms the cheeks often 

 protrude and the outer corners of the eye-orbits 

 are far forward. This produces the Mongolian 

 type of broad flat face, often with a wide space 

 between the orbits and a low flat bridge and 

 protruding eyes. The varying shape of the lower 



end of Mongolian noses is perhaps correlated with 



170 



