303 
1905-6.] Report on Two Crania. 
obtained an average angle of 93'7° for the females and of 91 *4° 
for the males. 
The angle of the bregma line fails altogether to give a true 
result in the case of the three skulls under consideration. As will 
be shown later, the frontal slope of the Brazil and Aberdeen skulls 
are almost identical as regards degree and quality, and yet the 
bregma angle separates them in this point widely from each 
other. 
The index of the frontal curve brings out satisfactorily the 
amount of forward bulge of the frontal bone. In the three 
specimens it is very nearly the same, and must be regarded as 
being exceptionally low. In a brachycephalic Irish skull I found 
the index 22*7, whilst in a dolichocephalic Scotch skull it was 18*6. 
From the various tests applied to the frontal region of the 
Rutland skull it becomes apparent that the forehead is unusually 
low and receding, although not in so great a degree as in the 
Brazil and Aberdeen specimens. 
Height of the Calvaria . — The base of the skull being absent, it 
is necessary to estimate the height of the calvaria by measuring 
the length of a line drawn from the most distant point of the 
longitudinal arc to the base line, and in such a direction as to cut 
the latter at right angles. An index of calvaria height can be 
estimated thus : — 
Calvaria height x 100 
Length of base line 
This method gives excellent results, seeing that the measurements 
from which the index is calculated deals with that part of the 
cranium which holds the great brain, or that portion of the 
cranial cavity which is subject to the largest amount of racial and 
individual change. 
Index of Calvaeia Height. 
Base Line. 
Height. 
Index. 
Rutland skull .... 
180 
100 
55-5 
Aberdeen . 
195 
98 
50*3 
Brazil, ,, 
51-6 
