NO. I 
NATIVES OF KHARGA OASIS HRDLICKA 
Percental 
Percental 
Mean 
Mean 
relation 
Mean 
relation 
Mean 
age 
nasal 
length 
to general 
average 
nasal 
breadth 
to general 
average 
nasal 
index 
length 
breadth 
The entire series of 150.. 
40.0 
4.87 
100 
3-73 
100 
76.6 
21 youngest adults . 
24 ^ 
476 
97 7 
<> A 
Of. c 
7 c a 
42 adults between 35 
6-v 
and 45 years of age.. 
40.O 
4.85 
99.2 
3.72 
99.7 
76.7 
c^ A 
4Q7 
102 1 
ind f\ 
JO 
y/ 
9 
These figures show that the average nasal measurements and in- 
dex in the adults in the " best " years agree very closely with the 
general averages of the entire series ; and that both the measurements 
and the index are smaller in the youngest and larger in the oldest 
adults than in those of mean age or in the Kharga series as a whole. 
These conditions, notwithstanding individual exceptions and varia- 
tions, are so regular and well marked that they can not be regarded 
as accidental. They bear evidence to the fact .that in general the 
nose grows both in length and breadth even after a fully adult life 
is reached, apparently even after 45 years of age; they show that 
the growth is perceptibly greater in the breadth than in the length ; 
and as a result of these alterations the mean nasal index increases 
with age, advancing towards platyrhiny. Judging from the writer's 
experiences with the Indian, the augmentation in length ceases some- 
where before the age limit of the present series, and later on the 
dimension may diminish; but the breadth seems to increase slightly 
or retain its maximum proportions unless affected by emaciation or 
pathological conditions, to the end of the life. A series of the oldest 
individuals in the Kharga Oasis would, it can be confidently ex- 
pected, show a nasal index of still higher value than that shown by 
the group of the oldest men that were measured. 
The differences in the mean nasal index in the youngest and that 
in the oldest men in the present series, suggested that the age factor 
might be responsible for what irregularities there were observed in 
the distribution of the index. But eliminating the " youngest " and 
" oldest " groups had actually the opposite effect, accentuating the 
main mode at 72.6-75, as well as the tendency towards a second 
mode at 77.6-80 and not influencing appreciably the third grouping 
at 85.1-87.5. And the large variability of the series is not dimin- 
ished. In this manner the curve of distribution of the index ap- 
proaches that obtained by Myers in the Valley and the probability 
grows that the irregularity is due to admixture, which otherwise 
passed undetected at Kharga, of the platyrhinic Soudanese. 
