480 
Hereditcmj Deafness 
TABLE XVIII. 
IN LlillUUi Ul 
Children 
Wltn 
T^pflf nnlv 
J-'Cclii. \J1H\ 
WTX 4-1, 
W Itll 
iviotner 
A-'ccll UUIV 
With 
both 
Parents 
Deaf 
Birmingham. Eoyal Institution for the Instruction 
of Deaf and Dumb children 
679 
1 
6 
1 
Exeter. Royal West of England Institution for the 
Deaf and Dumb 
66 
1 
1 
London. 10 L. C. C. Schools 
413 
1 
4 
Margate. Royal Asylum for the Deaf and Dumb ... 
1302 
27 
Newcastle-on-Tyne. Northern Counties Institution 
for the Deaf and Dumb 
1.54 
2 
4 
Stoke-on-Trent. North Stafibrdshire Joint School 
Authority's Blind and Deaf School 
170 
2 
1 
2 
Totals 
2784 
5 
10 
38 
TABLE XIX. 
Fathers. 
ren. 
Deaf 
Hearing 
Hearing- 
383 
924,329 
Q 
Deaf 
52 
3315 
h 
= 3-3087 
H 
= -001674 
h 
= 2-6849 
K 
= -010913 
r 
= -45 
TABLE XX. 
Fathers. 
CD 
Ic 
Q 
Deaf 
Hearing 
Hearing 
383 
7,179,796 
Deaf 
52 
3315 
h 
= 3-3087 
H 
= -001674 
k 
=3-8436 
K 
= -000247 
r 
= -58 
Tables XIX. and XX. give the paternal correlation coefficient. They were 
constructed from the material described above in exactly the same way as 
Tables III. and IV. were from Fay's data, except that the rate per million of deaf 
persons used was that of the 1901 English census, namely 468-71. The mean 
value obtained from them is ".SIS, while that obtained from Tables III. and IV. 
is -54. 
Tables XXI. and XXII. correspond exactly with Tables VII. and VIII., and 
like them they give a mean value for maternal correlation of -535. 
The material from which the fraternal correlation coefficients were deduced is 
shown in Table XXIII. It consists of 459 families from the register of the 
