his family seem to have originated with him." He married A.C., a niece
of his mother. They both lived to be over 80 and had ten children, of
whom three were insane; only six married, and of these only two are
known to have left surviving children. One of these a daughter, S.S.,
married E.S., a nephew of her father, and himself the offspring of a
second cousin marriage within the S. blood. E.S. and S.S. had five
children, all of whom married, and there is no further mention of
insanity. We may suppose, then, that the C. stock was neurotic, and
that a consanguineous marriage within that stock, although of the S.
surname, intensified the tendency into insanity, but with a further
infusion of the normal S. blood the morbidity was eliminated. It is
very evident that the heredity and not the consanguinity was the cause
of these three cases of insanity.

[Footnote 74: _Shattuck Memorials_, p. 118.]




CHAPTER VI

CONSANGUINITY AND THE SPECIAL SENSES


The most important source for this chapter is the special report on
the Blind and the Deaf in the Twelfth Census of the United States.[75]
This report was prepared under the direction of Dr. Alexander Graham
Bell, as Expert Special Agent of the Census Office.

[Footnote 75: U.S. Census, 1900, _Special Report on the Blind and the