M. L. TiLDESLEY 
259 
This is more than three times as great as the probable error, and may therefore 
be deemed significant, though the correlation is not high. Hence the conclusion 
that where the orbits are of unequal height, there is a significant but slight tendency 
for the pyriform aperture to descend lower on that side where the higher orbit 
exists. 
My thanks are due to Miss Noel Karn and Miss Margaret Moul of the Biometric 
Laboratory for assistance in working out the above Contingency and Correlation 
Tables. I am also deeply indebted to Professor Arthur Keith for the permission 
to photograph Chinese, Karen, Maravar and Malay crania in the collection of the 
Royal College of Surgeons. 
DESCRIPTION OF PLATES. 
The skulls selected to illustrate the difference in type in our Burmese series 
are all male, since the characteristic features are more marked in the male skull. 
The supposed hybrids (Type B) are unrepresented: I have contented myself with 
illustrations of the two extreme groups. 
Plates I-III show two skulls of Type A (Burman) from various aspects; 
Plate I, Fig. 1, Burman cj, No. 110, Norma lateralis. 
„ Fig. 2 ,, „ verticalis. 
,, Fig. 3 ,, ,, ,, facialis. 
Plate II, Fig. 4, Burman ^, No. 4, Norma occipitalis. 
,, Fig. 5 „ „ verticalis. . . 
„ Fig. 6 ,, ,, facialis. 
„ Fig. 7 ,, ,, basalis. 
Plate III, Fig. 8 „ „ „ lateralis. 
Plate III also shows a skull of Type C ( ? Karen) from two points of view : 
Plate III, Fig. 9, Burmese Type C, (J, No. 80, Norma lateralis. 
„ Fig. 10 ,, ,, ,, ,, facialis. 
In Plates IV, V and VI we have typical Karen*, Maravar, Hindu, Chinese and 
Malay skulls, for comparison : 
Plate IV, Fig. 11, Karen Norma facialis. 
,, Fig. 12 ,, „ lateralis. 
,, Fig. 13, Maravar (J, Norma facialis. 
,, Fig. 14 „ „ lateralis. 
Plate V, Fig. 15, Hindu ^, Norma lateralis. 
,, Fig. 16 ,, ,, verticalis. 
„ Fig. 17 ,, facialis. 
Plate VI, Fig. 18, Chinese (J, Norma facialis. 
,, Fig. 19 ,, „ lateralis. 
,, Fig. 20, Mala\' (J, Norma facialis. 
,, Fig. 21 ,, ,, lateralis. 
* The series from which the Karen skull was chosen was, perhaps, too slight (five in number) to enable 
me to assert that this one is "typical." It is however Karen. 
