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Side and front views of the round and orthognathous skull of a Calmuck, after Von Baer. I have arrived at the conviction that no comparison of crania is worth very much, that is not founded upon the establishment of a relatively fixed base line, to which the measurements, in all cases, must be referred. Nor do I think it is a very difficult matter to decide what that base line should be.
But it is singular to remark that, in another respect, the prognathous skulls are less ape-like than the orthognathous, the cerebral cavity projecting decidedly more beyond the anterior end of the axis in the prognathous, than in the orthognathous, skulls.
The profile of the face of the Negro, on the other hand, is singularly inclined, the front part of the jaws projecting far forward beyond the level of the fore part of the skull. In the former case the skull is said to be 'orthognathous' or straight-jawed; in the latter, it is called 'prognathous, a term which has been rendered, with more force than elegance, by the Saxon equivalent, 'snouty.
The gnathic index is 93, or orthognathous. The teeth are well preserved and not much worn, the 3d. molars not having erupted in either jaw. The face is short and broad, the height being 108 m.m. in and breadth 119 m.m., the orbit is inclined to be square with rounded angles and the type megaseme, the nasal index is mesorhine.
It appears, at once, from these views, that the prognathous skulls, so far as their jaws are concerned, 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.
The so-called prognathism of the Bantu has been cited as a racial mark denoting comparative nearness to the brutes, but when it is noted that anthropologists differ among themselves as to what constitutes this feature, whether it is to be measured from points above or below the nose or both, and when we are informed in some text books that while the negroes are prognathous, bushmen must be classed with Europeans as being the opposite, that is, orthognathous, and when, added to this, we learn from other quarters that white women are, on the average, more prognathous than white men, then the significance of this distinction, which in any case is not regarded as being relative to cranical capacity, is seen to be more apparent than real.
At the northern and eastern end of the same line there live the most brachycephalic, orthognathous, straight-haired, yellow-skinned of men the Tartars and Calmucks. The two ends of this imaginary line are indeed, so to speak, ethnological antipodes.
If a line be drawn from the Gold Coast in tropical Africa to the steppes of Tartary in central Asia, it will present two markedly distinct races of men at its two extremities. At its southwestern end we find the most long-headed, prognathous, frizzly-haired, dark-skinned race of mankind. At its northeastern end is the most round-headed, orthognathous, straight-haired, and yellow-skinned race.
A line drawn at right angles, or nearly so, to this polar line through Europe and Southern Asia to Hindostan, would give us a sort of equator, around which round-headed, oval-headed, and oblong-headed, prognathous and orthognathous, fair and dark races but none possessing the excessively marked characters of Calmuck or Negro group themselves.
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