E. Schuster 
481 
TABLE XXI. 
Mothers. 
d 
Deaf 
Hearing 
329 
805,373 
o 
j)eaf 
50 
2850 
TABLE 
XXIL 
Moth 
ers. 
d 
Deaf 
Hearing 
<D 
Hearing 
.329 
6,18.3,965 
o 
Deaf 
50 
2850 
/( =3-3087 
ff= -001674 
k =2-6887 
•010743 
-47 
K = 
h = 
R-- 
k -- 
^3--3087 
: -001674 
■3-8408 
•000250 
= -60 
TABLE XXIIL 
Showing Distribution of Deaf in Families used for Fraternal Correlation. 
Number 
of Persons 
in each 
Family 
1 
2 
3 
5 
6 
7 
8 
9 
10 
11 
12 
13 
U 
15 
16 
17 
18 
Totals 
National Association in Aid of the Deaf and Dumb 
Number of Deaf in Family 
10 
23 
47 
56 
48 
45 
33 
35 
25 
17 
16 
3 
5 
2 
1 
1 
2 
369 
50 
21 
15 
1 
Totals 
10 
25 
53 
65 
61 
62 
41 
44 
33 
26 
19 
3 
7 
4 
2 
1 
1 
2 
459 
Exeter and Manchester 
Number of Deaf in 
Family 
4 
17 
20 
23 
24 
10 
11 
5 
11 
4 
1 
133 
14 
Totals 
4 
18 
24 
29 
26 
12 
13 
6 
12 
6 
1 
2 
1 
155 
National Association : 
Exeter and Manchester 
Biometrika iv 
Mean size of family 6-19.39 ± -0954 
Standard deviation 3-0299+ ^0674 
Mean number of deaf per family 1 -3399 
Mean size of family 5-1871 ± -1489 
Standard deviation 2-7493±-1053 
Mean number of deaf per family 1 -2064 
61 
