0260 +- .0291
Adult brother and adult sister .2319 +- .0145
Minor brother and minor sister .1435 +- .0251
Adult brother and minor sister -.0062 +- .0349
Adult sister and minor brother -.0274 +- .0238
[191] The method used is the ingenious one devised by J. Arthur Harris
(_Biometrika_ IX, p. 461). The probable error is based on n=100.
[192] A. Ploetz, "Lebensdauer der Eltern und Kindersterblichkeit,"
_Archiv fuer Rassen-u Gesellschafts-Biologie_, VI (1909), pp. 33-43.
[193] Or it may be supposed that the environment is so good as to make a
non-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.
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