af relatives
on the part of the informant, without contradicting the hypothesis of
heredity.

Basing now our percentages on the totals of consanguineous and
non-consanguineous parentage respectively, and including only those
who answered the inquiry as to deaf relatives, it will be seen (Table
XXXI) that while of all the deaf less than one third are returned as
having deaf relatives, of the deaf who were the offspring of cousins
over one half (55.5 per cent) were returned as having (a) or (b) deaf
relatives.

Again taking into consideration only the congenitally deaf the results
are still more striking. Table XXXII shows that 66.5 per cent of the
congenitally deaf who are of consanguineous parentage are known to
have deaf relatives.

TABLE XXXI.
----------------------------------------------------------------------
| |Consanguinity |
| | of Parents. | Per cent.
| |-------------------------------------
| | |Not | | |Not
Class of Deaf Relatives. |Total.|Cousins|Cousins|Total|Cousins|Cousins
----------------------------------------------------------------------
Deaf relatives stated |80,481| 3,911 |73,639 |100.0|100.00 |100.00
----------------------------------------------------------------------
(a) relatives |21,660| 1,850 |18,838 | 26.9| 47.3 | 25.5
No (a) relatives |58,821| 2,061 |54,801 | 73.1| 52.7 | 74.5
| | | | | |
(a) or (b) relatives |25,851| 2,171 |22,552 | 32.1| 55.5 | 30.6
(a) and (b) relatives | 4,117| 412 | 3,587 | 5.1| 10.5 | 4.8
(a) and no (b) relatives |17,543| 1,438 |15,251 | 21.8| 36.8 | 20.7
(b) and no (a) relatives | 4,191| 321 | 3,714 | 5.2| 8.2 | 5.1
No (a) or (b) relatives |54,630| 1,740 |51,087 | 67.9| 44.5 | 69.4
----------------------------------------------------------------------
Symbols for deaf relatives: (a) deaf brothers, sisters or ancestors;
(b) deaf uncles, aunts, cousins, etc.; (c) deaf children;
(d) deaf husbands or wives.

TABLE XXXII.
-------------------------------------------------------------------------
| |Consanguinity |
| |of Parents. | Per cent.
| |------------------------------