Pearson, _Biometrika_ V, p. 124.
[203] Pearson (_ubi supra_) measured 12-year-old English school
children, and found the average cephalic index for 2298 boys to be
78.88, with [Greek: s] = 3.2, for 2188 girls 78.43, with [Greek: s] =
3.9. It is not proper to compare adolescents with adults, however.
[204] Sewall Wright has pointed out (_Journal of Heredity_, VIII, p.
376) that the white blaze in the hair can not be finally classed as
dominant or recessive until the progeny of _two_ affected persons have
been seen. All matings so far studied have been between an affected
person and a normal. It may be that the white blaze (or piebaldism)
represents merely a heterozygous condition, and that the trait is really
a recessive. The same argument applies to brachydactyly.
* * * * *
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