1898 - 99 .] Dr Hepburn on Improved Form of Craniometer. 607 
chimpanzee produced equality in the two segments, while in the 
skull of a young gorilla there was an excess of 3 mm. in favour of 
the left side, and an excess of 1 mm. in favour of the right side in 
the skull of a small Gibbon. 
Stephanie Diameter. — (a) Brachycephali. — In seven cases the 
right segment was in excess, and in four cases the left segment was 
the greater. On the right side, the variation lay between 2-9 mm., 
the average difference being 4 '8 mm. On the left side, the figures 
fluctuated from 1-11 mm., the average being 4 '5 mm. 
(b) Dolichocephali. — In nine cases the right segment was the 
greater, its fluctuations being from 1-16 mm., and the average 
excess being 6 mm. In three cases in which the left segment was 
the greater, the average excess was 4 mm. 
(c) Anthropoids. — In the four skulls examined, the right held 
the advantage in two cases, and the left in two cases. 
In the frontal region, therefore, viewed as a whole, the evidence 
seems to show that asymmetry is practically a constant feature ; 
that it does not exclusively select one side in preference to the 
other ; and that its amount tends to a higher average increase in 
the Stephanie region as compared with the minimum frontal area. 
While, however, the asymmetry is not confined to one side of 
the skull in particular, yet there is, in both of the regions above 
referred to, a decided preponderance in favour of the right segment. 
This is shown by the fact that, of the forty-six measurements of 
human skulls taken in these regions, no fewer than thirty-one 
gave the excess to the right side. Of the remaining fifteen 
measurements, in eleven the excess was on the left side, and 
only in four cases were the segments equal, and each of these 
four pertained to the minimum frontal diameter. 
In association with this definite asymmetry in the frontal region, 
it would be interesting to know whether these figures could be 
made to hear any conclusions with reference to the question of 
right- and left-handedness. 
Maximum Parieto-squamous Breadth. — (a) Brachycephali. — In 
six skulls the excess was on the right side, and varied from 1-8 
mm., the average being 4T mm. In the other five skulls the 
excess followed the left segment, and varied from 2-12 mm., the 
average being 5‘2 mm. 
