[187] See _Jewish Eugenics and Other Essays_, By Rabbi Max Reichler, New
York, Bloch Publishing Co., 1916.
[188] Dublin, Louis I., "Significance of the Declining Birth Rate,"
_Congressional Record_, Jan. 11, 1918.
[189] At the request of Alexander Graham Bell, founder and director of
the Genealogical Record Office, Paul Popenoe made an examination and
report on these records in the fall of 1916. Thanks are due to Dr. Bell
for permitting the use in this chapter of two portions of the
investigation.
[190] Beeton, Mary, and Karl Pearson, _Biometrika_ I, p. 60. The actual
correlation varies with the age and sex: the following are the results:
COLLATERAL INHERITANCE
Elder adult brother and younger adult brother .2290 +- .0194
Adult brother and adult brother .2853 +- .0196
Minor brother and minor brother .1026 +- .0294
Adult brother and minor brother -.0262 +- .0246
Elder adult sister and younger adult sister .3464 +- .0183
Adult sister and adult sister .3322 +- .0185
Minor sister and minor sister .1748 +- .0307
Adult sister and minor sister -.
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