European, where blondness is more or less prevalent.83 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. Hrdlička'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 immigrants84 measured at Ellis Island under Dr. Hrdlička'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. Anthropologists generally speak of any one with an index of 75 (or where the breadth is 75% of the length) and