584 THE BASILAE, OR OWENS METHOD. 



Fig. 2SS. Fig. 289. 



Negro. 



in his excellent memoir on the struc- 

 ture of the orang and chimpanzee. 



The relative proportions and extent, and the peculiarities of formation 

 of the different parts of the cranium, are more fully discovered by this 

 mode of comparison, which has hitherto been much neglected, than by 

 any other method." 



Fig- 200. mn 291< 



Skull of orang. 



Human skull. 



" It may be observed, in this view of the cranium, that the antero- 

 posterior diameter of the basis of the skull is in the orang very much 

 larger than in man. The most striking circumstance which displays 

 this difference is the situation occupied by the zygomatic arch in the 

 plane of the basis of the skull. In all races of men, and even in human 

 idiots, the entire zygoma is included in the anterior half of the basis cra- 

 nii ; in the head of the adult troglodyte, or chimpanzee, as well as in that 

 of the satyr, or orang, the zygoma is situated in the middle region of the 

 skull, and in the basis occupies just one third part of the entire length 

 of its diameter. Posterior to the zygomata, the petrous portions have, 

 in the simian, a larger development in the antero-posterior direction. 



