other race. Yet it should be remembered that some
of the Negritos included in this list are not pure types--in fact,
are no more than half-breeds.

The abnormal length of the arm of the Negritos has been regarded by
some writers as an essentially simian characteristic, especially in
the case of the pygmy blacks of Central Africa. With the Aeta this
characteristic is not so marked, yet 7 out of 8 males had a reach or
span greater than the height. The proportion was not so large among
the females, being only 2 in 3. The maximum span for males was 1,635
millimeters, for females 1,538 millimeters, but in neither case did the
individuals having the greatest span also have the greatest height. The
average span of 48 males exceeded the average height by 37 millimeters;
the difference in the case of the females was only 16 millimeters.

Length of arm was taken on only 19 individuals, 16 males and 3
females. The longest arm measured 675 millimeters (2 feet 3 inches),
which is not so long as the average Caucasian arm, though more out
of proportion to the height, in this case being nearly half the
latter measurement. The shortest arm, that of an adult female, was
539 millimeters (21 inches).

So far from being ape like in appearance, some of the Aeta are
very well-built little men, with broad chests, symmetrical limbs,
and well-developed muscles hardened by incessant use. This applies
of course only to the young men and boys just approaching manhood,
and is especially noticeable in the southern regions, where the Aeta
are generally more robust and muscular. The younger females are also
as a rule well formed. In the case of unmarried girls the breasts are
rounded and erect, but after marriage gradually become more and more
pendant until they hang almost to the waist line. With advancing age
the muscles shrink, the skin shrivels up until an individual of 40
to 50 years usually has the decrepit appearance of an octogenarian;
in fact, 50 is old age with the Aeta. (See plates.)

Anthropometric observations fall naturally into two groups, dealing
with the proportions of the head and body, the latter of which have
already been discussed. Great interest attaches also to the relative
proportions of the different dimensions of the head and especially
to the cephalic index obtained by multiplying the maximum breadth
by 100 and dividing by the maximum length. Heads with an index of
75 or under are called _dolichocephalic;_ those between 7