LECTURE VI. 



143 



angles whicli can be measured on the skull when bisected lon- 

 gitudinally, and which, as already explained in a previous lee- 

 Fig. 46. Base of a Skiill of an old Chimpanzee. 



ture, are of great importance for estimating the proportions of 

 the cranium to the face and jaws. The sella, or sphenoid angle, 

 is, as shown by Welcker, always smaller ; and consequently the 

 base of the cranium more bentj in man than in the ape, though 

 transitions do exist. 



The. nasal angle increases with the sphenoid angle, as may 

 be seen in the following table taken from Welcker : 



Cranium. 

 Mean of 30 male Germans . . . 

 Idiot aged 44 (Halle Collection) 



Three Negroes 



Idiot aged 31 (Gottingen) 

 Chimpanzee 



Three other Negroes 



Young Orang ... 



Swine Ape (Inuus nemestrinus) 



Old Orang 



Roll Ape (CeftMS opelZa) 





Nasal Angle. 



Splienoid Angle 



66-2 



134 





67-9 



138 





67-6 



138 





80 



145 





— 



149 





74-9 



150 





98 



155 





... 102 



170 





.. 104 



174 





.. 103 



180 



