Consanguineous Marriages in the American PopulationArner, George B. Louis (George Byron Louis)
Science
Consanguineous Marriages in the American Population
Arner, George B. Louis (George Byron Louis)
Consanguinity -- United States
Obviously this cannot be taken as typical of the actual distribution
of consanguineous marriages, since the more distant the degree, the
more difficult it is to determine the relationship. However it is very
evident that the coefficient of attraction is at its maximum between
first cousins, and probably there are actually more marriages between
first cousins than between those of any other recognized degree of
consanguinity. But the two degrees of 1-1/2 cousins and second cousins
taken together probably number more intermarriages than first cousins
alone. Allowing four children to a family, three of whom marry and
have families, the actual number of cousins a person would have on
each degree would be: First, 16; 1-1/2, 80; Second, 96; 2-1/2, 480;
Third, 576; Fourth, 3,456. The matter is usually complicated by double
relationships, but it will readily be seen that the consanguineal
attraction would hardly be perceptible beyond the degree of third
cousins.[27]
[Footnote 27: See note, _infra_, p. 29.]
Omitting, as in the discussion on page 24, those genealogies in which
only the male line is given we have the following table:
TABLE VIII.
--------------------------------------------------------------------
|First | 1-1/2 |Second | 2-1/2 | Third |Distant|
|cousins|cousins|cousins|cousins|cousins|cousins|Total
--------------------------------------------------------------------
Same-name | 24 | 5 | 10 | 4 | 2 | 5 | 50
Different-name| 62 | 15 | 33 | 12 | 23 | 26 | 171
--------------------------------------------------------------------
Total | 86 | 20 | 43 | 16 | 25 | 31 | 221
--------------------------------------------------------------------
It would naturally be supposed that with each succeeding degree of
relationship the ratio of same-name to different-name cousin marriages
would increase in geometrical proportion, viz. first cousins, 1:3;
second cousins, 1:9; third cousins, 1:27, etc., but on the other hand
there is the tendency for families of the same name to hold together
even in migration as may be proved by the strong predominance of
certain surnames in nearly every community. So that the ratio or
same-name to different-name second cousin marriage may not greatly
exceed 1:4. Beyond this degree any estimate would be pure guesswork.
However the coefficient of attraction between persons of the same
surname would undoubtedly be well marked in every degree of kinship,
and conversely there are few same-name marriages in which some
kinship, however remote, does not exist.
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