M. L. TiLDESLEY 
241 
Burmau; he has also a smaller orbital index {O^jOi), and an examination of the 
means of the absolute measurements on which this index is based shows that this 
is due to the greater height of the Burman orbit, the width being about the same 
in the two races. The nose again is larger in the Burman. 
Both sexes exhibit greater height of nose {NH) ; this is accompanied by greater 
width {NB) a feature however which is much more marked in the male than in the 
female, so that while the resultant index for female Burmans is not markedly different 
from that for female Malayans, this is not true of the male Burman whose nasal 
index (NBjNH) is considerably higher than the male Malayan's. Both sexes agree 
in giving a longer palate to the Malayan (G^), and as this is accompanied by 
greater face length (GL), i.e. greater projection of alveolar point from basion, we 
are led to infer that the Malayan is the more prognathous. Unfortunately, our 
data supply no measurement of the profile angle (P^) for male Malayans; for 
females we have it in six cases only, but these give the Malayan a considerably 
smaller angle, the difference being about six times the probable error. It will be 
remembered that the Burmese are frequently characterised by sub-nasal progna- 
thism: of true prognathism the examples are rare among them. 
It has frequently been remarked in the study of other races, that racial charac- 
teristics are more emphasised in the male than in the female. We shall accordingly 
be quite prepared for the discovery of characters in which the females of our two 
races manifest no significant difJerences, while males do so. Thus we find in the 
male Burman a considerably greater transverse arc {Q' — measured from auricular 
point to auricular point vertically over the top of the head) than in the Malayan. 
The difference is about five times the probable error. An examination of the 
figures shows that this is not due to greater height of skulh above the auricular 
axis (OH). It may be due in part to greater width at this point, but our two width 
measurements, namely, that for maximum width (B) and for width of forehead 
[B'), show no difference that can be regarded as significant. We have, however, 
noted in the Burman the heavy ridges carried back from the zygomatic arches 
above the auricular passages. It is possible that these have contributed somewhat 
to the length of the curve which crosses over them. Or, what is perhaps still more 
likely, the room for personal equation in determining the "auricular point" ac- 
cording to Frankfurt definition may have caused Dr Emil Schmidt, who measured 
the Malayan c? series, to select his terminals for this arc rather higher than I have 
done, thus shortening his transverse arc. Again, in the male Burman, we find a 
shorter occipital chord {S^') than in the Malayan. Whether the corresponding arc 
from lambda to opisthion (S^) is also less, and, accordingly, how the occipital 
indices of the two races compare together, we are unable to discover, since the arc 
measurement was one that Dr Schmidt did not take. Another racial difference is 
to be found in the male in the greater Burman breadth of face (GB) as measured 
by the width of the upper maxillary bone at the lower end of the malar-maxillary 
suture; associated with this is the greater nose-breadth which has already been 
noted. The palate, on the other hand, is wider in the Malayan, and we have already 
seen that it is longer and more projecting. The heavier development about the nose 
