394 A Study of the Nasal Bridge in the Anthropoid Apes 
sex of each ape, 10 to 40 of the various Asiatic races. Considering the smallness 
of these numbers, it did not appear needful, in view of the labour involved, to 
measure more than 50 of each sex of the English (Whitechapel) and Egyptian 
(xxvi — XXX dynasties) crania of which far larger numbers were at hand. 
Further in such small series the question of sexing becomes of considerable 
influence. With a large series of crania of one type, we sex on our knowledge 
of that series itself. But in short series one is apt to sex by a priori impressions 
of sex in other races, because we have not before us wide enough material to 
appreciate sex differences within the race itself. 
We propose to illustrate first the order of the differences which may arise 
from these sources, and we will deal first with sexing. Owing to the courtesy of 
Dr Deny we were able to test this point on 35 Nubian crania in his possession. 
They were independently sexed by Professor G. D. Thane and by Dr Derry 
himself*. The nasal measurements were taken and the mean values of the 
indices calculated. The following values were obtained, where we have added for 
comparative purposes those of other negro series : 
TABLE I. 
6 
? 
<$ 
? 
? 
s 
? 
Nubians : Professor Thane ... 
48-0 
40-9 
49-7 
43-6 
49-6 
40-0 
34-5 
23-4 
,, Dr Derry ... 
48-9 
39-7 
51-0 
42-1 
51-6 
37-7 
33 7 
23-5 
Gaboon : 1864 
42-9 
44-0 
43-6 
44-9 
40-0 
42-0 
30-9 
27-7 
1880 
42-9 
44-1 
44-8 
45-1 
41-9 
42-3 
29-0 
22-9 
Congo 
39-1 
37-2 
40-5 
38-6 
35 '5 
32-6 
25-6 
25-7 
"Negres": Merejkowsky 
25-6 
It will be seen that for short series the personal equation of sexing makes 
1 to 2 points difference in the indices, but that in two series of the same race — 
Gaboon, 1SG4 and 1880, — differences of this order may occur at least in the simotic 
index. If we compare Merejkowsky 's value for the simotic index with ours, we 
see that there would be excellent agreement if his somewhat vague "Negres" were 
from the Congo district. But we lay no stress on this agreement because we 
believe that Merejkowsky tends almost invariably to get a higher simotic index 
than we do. This is illustrated in Table II. 
Of course there are but few races common to both series and in Merejkowsky's 
series as in ours the numbers dealt with are miserably small, but still cases where 
* Before discussion there were four crania in a total of 35 on which there was difference of opinion, 
say 11 per cent., and we have used the original determinations, putting as usual ? 3 and ? ? with the 
3 's and ? 's respectively. 
