in VARIATIONS: HUMAN SKULLS. 199 



stantinople, of uncertain race, in my own pos- 

 session. 



It appears, at once, from these views, that the 

 prognathous skulls, so far as their jaws are con- 

 cerned, do really differ from the orthognathous in 

 much the same way as, though to a far less degree 

 than, the skulls of the lower mammals differ from 

 those of Man. Furthermore, the plane of the oc- 

 cipital foramen (b c) forms a somewhat smaller 

 angle with the axis in these particular prognathous 

 skulls than in the orthognathous; and the like may 

 be slightly true of the perforated plate of the eth- 

 moid — though this point is not so clear. But it is 

 singular to remark that, in another respect, the 

 prognathous skulls are less ape-like than the or- 

 thognathous, the cerebral cavity projecting decid- 

 edly more beyond the anterior end of the axis in 

 the prognathous, than in the orthognathous, skulls. 



It will be observed that these diagrams reveal 

 an immense range of variation in the capacity and 

 relative proportion to the cranial axis, of the differ- 

 ent regions of the cavity which contains the brain, 

 in the different skulls. Nor is the difference in the 

 extent to which the cerebral overlaps the cere- 

 bellar cavity less singular. A round skull (Fig. 30, 

 Const.) may have a greater posterior cerebral pro- 

 jection than a long one (Fig. 30, Negro). 



Until human crania have been largely worked 

 out in a manner similar to that here suggested — ■ 

 until it shall be an opprobrium to an ethnological 



