| | Not | Not | | Not | Not
Relatives.[A] |Total. |Cousins|Cousins|stated |Cousins|Cousins|stated
------------------------------------------------------------------------
Total |14,472 | 1,710 | 11,322| 1,440 | 11.8 | 78.2 |10.0
------------------------------------------------------------------------
Stated |13,428 | 1,647 | 11,110| 671 | 12.3 | 82.7 | 5.0
Not stated | 1,044 | 63 | 212| 769 | 6.0 | 20.3 |76.7
(a) relatives | 5,295 | 986 | 3,961| 48 | 18.6 | 74.8 | 6.6
(b) and (c) but | | | | | | |
no (a) relatives| 860 | 126 | 686| 48 | 14.6 | 79.8 | 5.6
No (a), (b) or | | | | | | |
(c) relatives | 7,273 | 535 | 6,463| 275 | 7.3 | 88.9 | 3.8
------------------------------------------------------------------------
[A] Symbols for deaf relatives: (a) deaf brothers, sisters or
ancestors; (b) deaf uncles, aunts, cousins, etc.; (c) deaf children.

A further analysis of the congenitally deaf according to consanguinity
of parents and deaf relatives, as in Table XXX, helps to determine to
what extent the greater number of deaf children to a family among the
offspring of consanguineous marriages has influenced the totals. From
the report it cannot be determined how many of the congenitally deaf
had (a), (b) or (c) relatives alone, but the existence of (b) and (c)
relatives would almost certainly indicate that the deafness was
hereditary. Of these 14.6 per cent were the offspring of cousins,
while of those having (a) relatives 18.6 per cent were the offspring
of consanguineous unions. Thus it would seem to be a more reasonable
conclusion that where two or more deaf-mutes appear in the same
family, at least a tendency toward deaf-mutism is hereditary in the
family and is intensified by the marriage of cousins, rather than that
consanguineous marriage is in itself a cause. The fact that in many
cases the relationship would "work both ways" would not greatly affect
the percentage of the offspring of cousins having (b) and (c)
relatives, for the chance would be slight that the (b) or (c) relative
would be himself the offspring of a consanguineous marriage. Among the
congenitally deaf who reported no deaf relatives, the percentage of
consanguineous parentage is still high, (7.3 per cent), but this
excess can easily be accounted for by the ignorance of de