TABLE XXVIII. ------------------------------------------------------------------------- | | | | | Consanguinty | | | of Parents. | Per cent. | |--------------------|----------------- | | | | | | | Cause of Deafness. | | | Not | Not | | Not | Not |Total.|Cous- |Cous- | Sta- |Cous-|Cous-| Sta- | | ins. | ins. | ted. | ins.| ins.| ted. ---------------------------|------|------|------|------|-----|-----|----- | | | | | | | Total |89,287| 4,065|75,530| 9,692| 4.5| 84.6| 10.9 ---------------------------|------|------|------|------|-----|-----|----- Affections of external ear | 871| 29| 760| 82| 3.3| 87.3| 9.4 Affections of middle ear |34,801| 1,238|30,824| 2,739| 3.5| 88.6| 7.9 Affections of internal ear |12,295| 343|11,121| 831| 2.8| 90.4| 6.8 Unclassified |31,205| 2,183|25,281| 3,741| 7.0| 81.0| 12.0 Unknown |10,115| 272| 7,544| 2,299| 2.7| 74.6| 22.7 | | | | | | | Scarlet fever | 7,424| 285| 6,647| 492| 3.9| 89.5| 6.6 Disease of ear | 4,210| 222| 3,683| 305| 5.3| 87.5| 7.2 Catarrh |11,702| 304|10,450| 948| 2.6| 89.3| 8.1 Colds | 3,074| 81| 2,666| 327| 2.6| 86.7| 10.7 Meningitis | 3,991| 83| 3,741| 167| 2.1| 93.7| 4.2 Old age | 3,361| 38| 2,369| 954| 1.1| 70.5| 28.4 Military service | 3,242| 40| 2,897| 305| 1.2| 89.4| 9.4 Congenital |14,472| 1,710|11,322| 1,440| 11.8| 78.2| 10.0 ------------------------------------------------------------------------- But on the other hand, 53.4 per cent of the deaf whose parents were cousins had deaf relatives of the (a) and (b) groups, while of those whose parents were not cousins, only 29.9 per cent in these groups had deaf relatives. In Table XXIX the close connection between deaf relatives of these groups and consanguinity is shown. For the sake of simplicity no account is taken of (c) relatives (deaf children), and (d) relatives (deaf husbands or wives), for in the first case only 370 deaf are reported as having deaf children and at the same time no (a) or (b) relatives, and in the Second case (d) relatives are not ordinarily blood relatives at all.