258 
A First Study of the Burmese Skull 
for either side to exceed the other. Thus, taking all the adults of the collection 
together, we get 51-45 mms. as the mean nasal height on the right side against 
51-36 mms. on the left; 34-51 mms. is mean height of right orbit, 34-59 mms. mean 
of left: in both cases a difference of only about -085 mm. between right and left. 
In the bones of the individual face, however, as also in the lines of the hving 
face, exact symmetry is by no means a rule. Is the lack of symmetry in one fea- 
ture usually associated with lack of symmetry in another ? Is inequality in height 
of orbits generally accompanied by inequality in nose-height measured right and 
left? and, if so, is the higher orbital height on one side associated with greater 
height of nose on that same side or the other side? 
This question it was possible to answer with considerable exactness as far as 
my own series was concerned, by means of a Correlation Table in which one variate 
was the excess or defect of left nasal height over right, divided by right nasal 
height; and the other was the corresponding measure of orbital inequality. The 
range of difference in absolute height was from -f 2-7 mms. to — 2-1 mms. for the 
nose and from + 2-2 mms. to — 2-2 mms. for the orbit. This gave for the nasal index 
^^^/NH(R)-NH{L)\ r ro . A, J X 1.-. 1 
100 1^ jfjjj^ j ^ range of + 5"3nims. to — 4'4mms. ; and for the orbital 
index 100 
^0,iR)-0,{L)\ 
0,{R) J-^--^^g««f 
5"9 mms. to — 6'6mms., these varieties 
being divided into 11 and 13 categories respectively. 
Correlation Table between Nasal and Orbital Asymmetry. 
NH{R)- NH{L) 
NHiR) 
X 100 
to 
i 
to 
Ol 
'^3 
1 
1 
Oi 
'--H 
1 
1 
o 
+ 
+ 
+ 
+ 
-1- 
+ 
Totals 
-6-95 
1 
1 
2 
4 
-5-95 
2 
1 
1 
1 
5 
-4-95 
3 
2 
1 
6 
-3-95 
1 
2 
3 
1 
7 
-2-95 
1 
1 
2 
7 
4 
3 
18 
-1-95 
2 
1 
1 
5 
1 
10 
- ■95 
3 
3 
8 
5 
4 
23 
+ -05 
1 
4 
2 
1 
8 
+ 1-05 
4 
3 
3 
1 
1 
12 
+ 2-05 
2 
8 
1 
1 
12 
+ 3-05 
2 
4 
1 
1 
2 
10 
+ 4-05 
— 
+ 5-05 
1 
1 
2 
Totals 
1 
2 
11 
13 
42 
24 
16 
4 
3 
1 
117 
o 
o 
IN 
O 
I 
g 
O 
The standard deviation of the difference in nasal height R and L was found to 
be 1-53, that of the difference in orbital height 2-76; and we obtain a coefficient 
of correlation between greater orbital height on one side and greater nasal height 
on the same side of the value r = + '2160 ± -595. 
