M. L. TiLDBSLEY 
257 
table of the same kind (9-celled) as the previous ones. I also connected by a 
table the data relating to occipital asymmetry and size of jugular foramen, though 
one naturally expected the association to be rather less in this case. 
Greater Occipital Prominence 
> 
o 
o 
Right 
Equal 
Left 
Totals 
Right 
24 
18 
52 
94 
Equal 
6 
1 
6 
13 
Left 
8 
9 
11 
28 
Totals 
38 
28 
09 
135 
Greater Occipital Prominence 
IB 
Right 
Equal 
Left 
Totals 
Right 
23 
17 
42 
82 
Equal 
5 
3 
5 
13 
Left 
6 
8 
18 
32 
Totals 
34 
28 
05 
127 
The results were as follows : 
Association of greater occipital prominence on one side, with main lateral 
groove on the other side: coefficient of mean squared contingency C'2 = -2035. 
Association of greater occipital prominence on one side with greater jugular fora- 
men on the other side: coefficient of mean squared contingency 6*2 = -ISIO. The 
number of cases is 127, and the mean value of 6*2 where there is no contingency in 
the sampled population is again of the order -17 ± -06. 
One has to conclude therefore that in this series there is no significant asso- 
ciation between outer occipital asymmetry and the direction in which the main 
occipital sinus is turned when its course is changed from longitudinal to lateral. 
The remaining point dealt with in this investigation concerned the asymmetry, 
not of the cranium, but of the face; and for this I was able to use actual measure- 
ments instead of merely appreciative methods to provide the data. It has been the 
custom among the workers of this school to take measurements of both orbits, not 
of one alone as did the older craniometricians (usually without specifying which), 
but in the case of the nose the nasal height has previously been taken to the lowest 
part of the edge of the pyriform aperture on one side only, the left, unless this 
was missing, in which case the measurement was taken on the right side. I have, 
however, taken the measurements on both sides. 
It is obvious on comparing the means- of the various series for height of orbit 
and height of nose, that symmetry is the normal condition: there is no tendency 
