[200] The exact distribution is:
Male Female
Light-brown 12% 16%
Medium-brown to dark 77 68
Very dark 11 6
Golden-red and red 0 10
Dr. Hrdlicka's classification of the eye is as follows:
Male Female
Gray 2% 4%
Greenish 7 10
Blues 54 50
Browns 37 36
The head among Old Americans is in many cases notable for its good
development, particularly in males. Among 12 groups of male
immigrants[201] measured at Ellis Island under Dr. Hrdlicka's
direction in recent years, not one group quite equals in this respect
the Americans, the nearest approach being noted in the Irish, Bohemians,
English, Poles, and North Italians. The type of head, however, differs
among the Americans very widely, as is the case with most civilized
races at the present day.
Head form is most conveniently expressed by means of the cephalic index,
that is, the ratio of breadth to length.
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