400 A Study of the Nasal Bridge in the Anthropoid Apes 
Egyptian, roughly we must subtract one point from the calculated to get the 
actual value of the index ; for the Chimpanzee, the Hindoos and the inhabitants 
of the Philippine and Molucca Islands two points must be subtracted ; for those 
of the Celebes, Borneo, Java and Sumatra three points, for the Veddahs five 
points, and for the Orang-utan and Gibbon 14 to 20 ! Thus as we pass from 
Africa and the region of the Gorilla through Europe to Asia and to the East 
Indian Islands and the region of the Orang-utan we get roughly a continuous 
divergence from the catenary hypothesis, which fits the Gorilla, to a markedly 
non-catenary relation as in the case of the Orang*. While the Aino and Veddah 
have equal flatness of the nasal bones as measured by the simotic index, they 
stand at opposite ends of the scale with regard to a catenary hypothesis of the 
whole bridge of the nose. No attempt, however, is made to deduce any racial 
order from Table IV although it is not without suggestiveness. 
Another method of approaching the degree of relationship of a! to a is to 
consider the correlation coefficient between them, r aa -. 
shows that it is very high. We have, averag-ino- results 
A glance at Table XX 
TABLE V. Correlation r, 
Chimpanzees and Orang-utans 
Gibbons (Ht/lobates) 
East Asiatic Group 
Gorillas 
Negro Group 
Hindoos 
Egyptians and English 
Veddahs 
754 
815 
878 
906 
923 
931 
964 
965 
Finally in order to calculate the value of a from a for a given individual of one 
of the races dealt with, we append the regression lines, which provide the most 
probable value of a for a given a . 
TABLE VI. 
Male 
Orang-utans a = 
Ch impanzees a = 
Veddahs a- 
Congo a - 
Egyptians a = 
Philippine a = 
Javanese a - 
Gaboon, 1864 a- 
English a- 
Hindoos a = 
Borneo a = 
•6697a' + 12-99 
•6629a' + 8-66 
•8324a' + 5 '75 
•8431a'+ 4-91 
•9359a' + 2-25 
•9448a' + 1-25 
•9359a' + -82 
•9782a' + -23 
■9756a' + -22 
•9665a' + -11 
■9645a'- 1-16 
Gaboon, 1880 a = l -0045a'- 2-09 
Gorillas a = l - 0750a'- 3 -29 
Orang-utans 
Chimpanzees 
Gorillas 
Egyptians 
Gaboon, 1880 
Gaboon, 1864 
English 
Congo 
Female 
a= -5053a' + 28 
a= -6096a' + 10 
a= -8404a' + 7 
a= -8877a' + 4 
a= -8842a' + 4 
a= -8931a'+ 3 
a = l-0037a' + 
a= -9739a'- 
" Mixed" Malays a = l -0420a'- 5 
Veddahs a = 1 -1203a' - 12 
50 
11 
93 
28 
94 
27 
36 
76 
71 
Gibbons, Hylobates „^„,, , . ,,"] 
* The reader will observe (see contours, pp. 428—9) that it is not proper to speak of a catenary form of 
the nose. The English and Gorilla noses are not at all catenary in contour, but the chord and subtense 
relation is on the average clearly that of the catenary chord and subtense. 
