tained in the distantly related cases.

[Footnote 83: Huth, _Marriage of Near Kin_, p. 227.]

[Footnote 84: _Cf. supra_, p. 42.]

In Table XXVI it will be seen that 52.5 per cent of the deaf-mute
offspring of consanguineous parents were the offspring of first cousin
marriages. On the assumption that this percentage is fairly typical of
each set of returns we may say that from three to six per cent of the
Irish deaf-mutes are the offspring of first cousin marriages. If,
then, the proportion of first cousin marriages is no greater than in
England, the percentage of deaf-mute offspring is several times as
great as in the average non-related marriage.

TABLE XXVI.
--------------------------------------------------------------------------
| 1871 | 1881 | 1871 and 1881
|-----------------------------------------------------------
| |Number| | |Number| | |Number|
| | of |Aver | | of |Aver | | of |Aver
|Number|conge-|age |Number|conge-|age |Number|conge-|age
Consanguinity | of |nital |per | of |nital |per | of |nital |per
of |mar- |deaf- |mar- |mar- |deaf- |mar- |mar- |deaf- |mar-
Parents. |riages|mutes |riage|riages|mutes |riage|riages|mutes |riage
--------------------------------------------------------------------------
First cousins | 72 | 128 | 1.78| 74 | 123 | 1.66| 146 | 251 | 1.72
Second cousins| 50 | 89 | 1.78| 29 | 46 | 1.58| 79 | 135 | 1.71
Third cousins | 24 | 40 | 1.67| 9 | 21 | 2.33| 33 | 61 | 1.85
Fourth cousins| 5 | 11 | 2.20| 1 | 1 | -- | 6 | 12 | 2.00
Fifth and | | | | | | | | |
sixth cousins | 12 | 19 | 1.58| not stated | 12 | 19 | 1.58
--------------------------------------------------------------------------
Total | 163 | 287 | 1.76| 113 | 191 | 1.69| 276 | 478 | 1.73
No | | | | | | | | |
relation- | | | | | | | | |
ship[A] |2,842 |3,609 | 1.27|2,474 |3,229 | 1.31|5,316 |6,838 | 1.29
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Grand total |3,005 |3,896 | 1.30|2,587 |3,420 | 1.32|5,592 |7,316 | 1.31
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