Etienne Rabaud in the _Journal of Heredity_, Vol. V, No. 9, pp.
389-400; September, 1914.
[30] It will be recalled that the coefficient of correlation measures
the resemblance between two variables on a scale between 0 and-1 or +1.
If the correlation is zero, there is no constant relation; if it is
unity, any change in one must result in a determinate change in the
other; if it is 0.5, it means that when one of the variables deviates
from the mean of its class by a given amount, the other variable will
deviate from the mean of its class by 50% of that amount (each deviation
being measured in terms of the variability of its own class, in order
that they may be properly comparable.)
[31] Sidis, Boris, M.A., Ph.D., M.D., "Neurosis and Eugenics," _Medical
Review of_ _Reviews_, Vol. XXI, No. 10, pp. 587-594, New York, October,
1915. A psychologist who writes of "some miraculous germ-plasm
(chromatin) with wonderful dominant 'units' (Chromosomes)" is hardly a
competent critic of the facts of heredity.
[32] In a letter to the _Journal of Heredity_, under date of August 4,
1916.
[33] Galton, Francis, _Inquiries into Human Faculty_, p. 167, London,
1907.
[34] Woods, Frederick Adams, _Heredity in Royalty_, New York, 1906.
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