418 A Study of the Nasal Bridge in the Anthropoid Apes 
On this tree we have placed the mean values of the mesodacryal subtense 
index (a) and the average variability of the mesodacryal lengths*, both for 
males to indicate the degree of correspondence suggested. 
In such a tree as this we see the general tendency of the higher races to have 
(1) a more developed nasal bridge, and (2) a markedly lessened variability. The 
tree is merely diagrammatic and no great stress is of course laid on it, but it does 
suggest that the results reached both for mean values and variabilities may not be 
merely contradictory, but correspond to a real evolutionary order in the develop- 
ment of the nasal bridge. 
(9) On the Correlations of the Nasal Bridge Characters. 
The correlations of the two mesodacryal indices and the simotic index are 
given in Table XX. 
TABLE XX. 
Coefficients of Correlation. Nasal Bridge Indices. 
r 
*P 
r , 
aa 
r Sa 
$ 
? 
6 
? 
6 
Congo ... 
50 
•881 + 
•021 
27 
•864 + 
•033 
50 
■882 + 
•021 
27 
•867 + 
■032 
50 
•613 + 
■060 
25 
•704 + 
•068 
Gaboon, 1864 
48 
•904 + 
•018 
37 
•941 + 
•013 
48 
•905 + 
•018 
37 
•945 + 
•012 
47 
•258 + 
•092 
35 
•509 ± 
•084 
Gaboon, 1880 
16 
■976 ± 
•008 
18 
•959 ± 
•013 
16 
•978 + 
■007 
18 
■959 ± 
•013 
16 
•423 ± 
•138 
18 
•508 + 
•118 
Philippine Islands 
17 
•725 + 
•078 
17 
•727 ± 
■077 
17 
•374 + 
•141 
Borneo ... 
26 
•948 + 
•013 
26 
■945 + 
•014 
26 
•426 + 
•108 
Java and Madura 
39 
•940 ± 
•013 
39 
■944 ± 
•012 
39 
•318 + 
•097 
Mixed " Malays " 
24 
•897 ± 
•027 
24 
■897 ± 
•027 
23 
•696 ± 
•073 
Hindoos ... 
10 
•929 + 
•029 
10 
•931 + 
•028 
10 
•891 ± 
•044 
English 
50 
•955 + 
•008 
50 
•961 + 
•007 
50 
•956 + 
■008 
50 
•962 + 
•007 
50 
•440 + 
•077 
50 
•519 + 
•070 
Egyptians 
50 
•976 + 
•005 
50 
■964 + 
•007 
50 
•975 + 
•005 
50 
•964 + 
•0C7 
50 
•444 + 
•077 
50 
•471 + 
•074 
Veddahs 
15 
•959 ± 
■014 
12 
■971 ± 
•on 
15 
•958 ± 
•014 
12 
■972 ± 
•on 
15 
■291 ± 
•159 
12 
•369 ± 
•168 
Chimpanzees 
O'J 
•675 + 
•064 
18 
■782 + 
•062 
•674 + 
■064 
18 
•784 + 
■061 
13 
■062 + 
•186 
Gorillas ... 
27 
•889 + 
■027 
25 
•928 + 
•019 
27 
•888 + 
■027 
25 
•924 ± 
•020 
21 
•740 ± 
•067 
19 
•464 ± 
•121 
Orang-utans 
44 
•839 + 
•030 
13 
•720 + 
■090 
44 
•844 + 
•029 
13 
•715 + 
•091 
Gibbons, Hylobates $ + 9 
25 
•812 ±-046 
25 
•815 ± -045 
16 
•199 ±-162 
We have already (see pp. 399 — 401) discussed the relation of a to a' and seen 
that it does not lead us to any very marked racial order. The correlation of the two 
mesodacryal indices gives a somewhat clearer result, if we group the correlations 
thus: 
* Coefficients of variation of arc, chord and subtense. 
