206 SOME NOTES ON THE EARLY HOMINIDZE 
‘ Ancient Hunters,’ 1911). The front teeth do not project ; 
they are curved at their roots on account of following the 
sloping contour of the jaw in the region of the symphysis 
menti. It is an ascertained fact that in apes the third molar 
is cut either before or, at the latest, at the same time as the 
permanent canine. Supposing the jaw to have belonged 
to an ape, one would have found that the third molar was 
Fig. 5. — The Heidelberg Jaw. 
A, From the side ; B, from 
above. 
as much worn as the canine, but in the Heidelberg jaw this is 
not the case — a strong factor in favour of its human character. 
This interesting fact was pointed out by Dr.Siffre (see ‘ A propos 
de la mandibule Homo Heidelbergensis,’ Bull. Soc. Anthro'p. 
Paris, 1909). 
The jaw itself shows little that is human in its appearance. 
Its principal characteristic is its enormous body, and the 
great breadth of the ascending rami. The merest tyro in 
anatomy could not fail to be struck by these simian characters, 
and had this jaw been devoid of teeth, there are some anatomists 
who would doubtless have described it as belonging to an 
ape (Fig. 5). 
