on-selective death less likely, and therefore such deaths as do occur
must more frequently be selective.

[194] Hibbs, Henry H., Jr., _Infant Mortality: Its Relation to Social
and Industrial Conditions_, New York, 1916.

[195] See Castle, W. E., _Heredity_, pp. 30-32, New York, 1911.

[196] Doll, E. A., "Education and Inheritance," _Journal of Education_,
Feb. 1, 1917.

[197] Atwater's celebrated experiments proved that all the energy (food)
which goes into an animal can be accounted for in the output of heat or
work. They are conveniently summarized in Abderhalden's _Text-book of
Physiological Chemistry_, p. 335.

[198] In this connection see farther Raymond Pearl's review of Mr.
Redfield's "Dynamic Evolution" (_Journal of Heredity_) VI, p. 254, and
Paul Popenoe's review, "The Parents of Great Men," _Journal of
Heredity_, VIII, pp. 400-408.

[199] See Dr. Hrdlicka's communication to the XIXth International
Congress of Americanists, Dec. 28, 1915 (the proceedings were published
at Washington, in March, 1917); or an account in the _Journal of
Heredity_, VIII, pp. 98 ff., March, 1917.

[200] Cf. Grant, Madison, _The Passing of the Great Race_p. 74 (New
York, 1916): "One often hears the statement made that native Americans
of Colonial ancestry are of mixed ethnic origin. This is not true. At
the time of the Revolutionary War the settlers in the 13 colonies were
not only purely Nordic, but also purely Teutonic, a very large majority
being Anglo-Saxon in the most limited meaning of that term. The New
England settlers in particular came from those counties in England where
the blood was almost purely Saxon, Anglian, and Dane."

[201] Comprising Armenians, Croatians, English, Greeks, Russian Jews,
Irish, South Italians, North Italians, Magyars, Poles, Rumanians and
Russians, 500 individuals in all.

[202] English data from K. 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.