OUR BEST FEATURES 



comparative anatomy nor the embryonic develop- 

 ment of this region give the slightest support to 

 those who stress the isolation of man. On the 

 contrary, they show quite conclusively that man 

 and apes are merely the divergently modified 

 derivatives of a common pro-anthropoid stock and 



Sinus ^^ 



/pituitaryfossa 



iotic^r ^'^^f ^^^-*(^^S^W^A^-''"' 'sinus 



SphenoioC 



Fig. 85. Connections of the Frontal, Ethmoid and Sphenoid 

 Sinuses with the Nasal Meati (after Keith). 



that with regard to this region civilized man has 



become much further modified away from the 



primitive ancestral condition than either the gorilla 



or the chimpanzee. 



In earlier human stages of development (Fig. 



86) the nostrils are widely separated, almost as in 



the South American monkeys. Later (Fig. 86E) 



the opposite halves of the nose grow together. 



At this stage the nose is very wide in proportion 



163 



