1905-6.] 
Report on Two Crania. 
301 
This may be called the frontal angle', and whilst it is calculated 
to give a fair general idea of the slope of the forehead, it must not 
be forgotten that the varying degree of prominence of the glabella 
constitutes a disturbing element and introduces a different factor 
into the result. In skulls such as those under consideration, where 
the supraorbital projection is great, the general slope of the frontal 
bone is exaggerated through the pushing forward of the lower end 
of the frontal line. 
Fig. 3. — Australian Cranium — low type. Tracing of mesial longitudinal arc 
obtained by American periglyph. Reduced by one-half. 
(3) A third method of estimating the slope of the forehead 
which has been employed by Schwalbe consists in drawing a line 
from the most prominent part of the glabella to the bregma 
(bregma line), and measuring the angle which it forms with the 
base line. This is not a satisfactory plan, because it altogether 
leaves out of count the degree of forward bulge of the frontal bone, 
and, as already mentioned, this is quite as important a factor in 
determining a vertical forehead as the general inclination of the 
bone. 
None of these methods, therefore, are altogether trustworthy, 
although in all probability the frontal angle gives the best results. 
