202 
A First Study of the Burmese Skull 
the two auricular points (in practice the "craniophor auricular points*"), then 
when the sagittal plane is adjusted in a horizontal position for this contour, the 
interauricular axis will be in a plane vertical to it, and the projections of the two 
auricular points on our paper will be in the same straight line as the sub-orbital 
point, this line being parallel to the horizontal axis Ny. If, in addition, our vertical 
plane (which determines the apex and has been made perpendicular to the hori- 
zontal plane) be also exactly perpendicular to the sagittal plane, the projections 
of our two auricular points will coincide. They will also coincide with the perpen- 
dicular drawn in the sagittal contour from the apex to the horizontal line through 
the sub-orbital point. All this, however, supposes a high degree of symmetry in 
the skull, such as I have found comparatively few skulls to possess. We must 
also take into account the fact that the "craniophor auricular points"— i.e. the 
points which actually touch the ear-rods and from which the horizontal plane is 
determined — are frequently not accessible by the pointer of the Klaatsch when 
the skull is lying on its side, so that it is the "auricular points by definition" 
which are actually used for projection on the paper. We thus see that it would be 
possible, but for the limitations of our contour tracer, to obtain five "auricular 
points" on every sagittal contour, and while they might all coincide, the odds are 
against such coincidence. As it is, we have three, and of these I have used that 
obtained by the perpendicular from the apex on the sub-orbital horizontal, for 
my measurements; but shall discuss later the differences of position between this 
and the other two. 
This completes the measurements which were used in the construction of the 
type sagittal contours. (See Figs. XIII-XVIII.) 
I have to place on record my thanks to Miss A. G. Davin for the preparation 
of all the graphs of my type contours. 
Our record-sheet entries are: 
Ny 
Vertex 
Glabella 
X from N 
y 
X from N 
y 
Ox 
Gy 
Ordinates above Ny 
0 
Nl 
1 
2 
3 
4 
5 
6 
7 
8 
9 
7i 
7i 
7 
* See above, p. 181 
