Page:American Anthropologist NS vol. 1.djvu/514  From Wikisource
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boas] the cephalic index 455  is negative, R will be less than
r. This will be the case when /j is larger than X t and /„
smaller than A n , or vice versa.  I think this effect of
mixture is a sufficient explanation of the low value of the
coefficient of correlation for Paris, where we find a very
heterogeneous population embracing narrow- and long- headed
subjects from northern France and very broad- and short- headed
ones from southern France. The same explanation seems plausible
for the Shuswap and the tribes of northern British Columbia. The
high value for Eskimo skulls may be due to the fact that a
number of female skulls were counted as male skulls. This would
have the effect of raising the coefficient of correlation
between the diameters of the head.  When the type is dis-
homogeneous owing to mixed descent, the coefficient of
correlation will depend upon the law of heredity. If