Kathleen V. Ryley and Julia Bell 
399 
There are bones other than those of the nasal bridge which might give racially 
significant micrometric measurements, although specially designed apparatus, or 
an adaption of existing physical instruments as yet unused in craniometry, would 
have to be employed in their determination. 
(3) On the observed (a) and calculated (a') values of the subtense mesodacryal 
index. 
In the discussion on the negro skull (loc. cit. pp. 297, 310) it was pointed out 
that our original measurements of the mesodacryal chord and arc leading to the 
index /3 did not enable us to determine the subtense directly, or indirectly, until 
some assumption was made as to the shape of the bridge of the nose. We were 
not at the time these measurements were suggested to Dr Crewdson-Benington 
aware of Merejkowsky's instrument, which is as available for finding the mesodacryal 
subtense as for its designed purpose the determination of the simotic subtense. 
Accordingly after some consideration the catenary was selected as a fairly suitable 
curve for the nasal bridge and by means of it the value of the subtense meso- 
dacryal index (a') was deduced from /3. In the present investigation a has been 
found directly and it is of much interest to test the legitimacy of the catenary 
hypothesis. 
TABLE IV. Differences a — a of Calculated («') and Observed (a) Values 
of Mesodacryal Subtense Index. 
6 
? 
Average 
Gorilla... 
0-21 
0-07 
0-14 
Ainos ... 
036 
0-36 
Ne°roes ) Cjfaboon ( 1864 + 1880 ) 
° " (Congo 
1-01 
1-45 
0- 88 
1- 37 
0-94 
1 -41 
English 
1-19 
-0-47 
0-36 
Egyptians 
1-53 
1 -12 
1-32 
Chimpanzees ... 
1-64 
1-41 
1-52 
Philippine Islands 
1-10 
2-16 
1-63 
Moluccas 
1-63 
1-63 
Hindoos 
1-79 
3-12 
2-45 
Celebes 
2-41 
2-41 
Borneo... 
2-76 
3-86 
3 31 
Javanese 
2-20 
2-80 
2-50 
Sumatra 
3 73 
3-73 
Veddahs 
4-58 
4-99 
4-78 
Orang-utans ... 
17-33 
20-23 
18-78 
Gibbons 
j. q o j Hylobates 18-60 
6 + ¥ + 6 iSi/mphalangusU-22 
18-60 
14-22 
We see, to judge by this Table, that the hypothesis of the catenary suits the 
Gorilla and the Aino nose very closely; it is fairly good for Negro, English and 
51 2 
