1909-10.] The Significance of the Correlation Coefficient, etc. 485 
Husbands. 
Wives. 
(a, a). 
(a, b). 
(b, t>). 
(a, a) . 
m 
2m 
n 
(a, b) . 
2m 
4m 
2 n 
(b, b) . 
n 
2 n 
m 
which gives the parent and offspring table : — 
reducing to — 
or 
Parent. 
Offspring. 
(a, a). 
(a, b). 
(b, b). 
(a, a) . 
2m 
2m 
(a, b) . 
m + n 
3 m + n 
2 n 
(b, b) . 
m + n 
m + n 
Parent. 
Offspring. 
(a, a) + (a, b). 
(b, b). 
(a, a) + (a, b) 
(b, b) . . 
8m + 2w 
m + n 
2 n 
n + m 
Parent. 
Offspring. 
(a, a) + (a, b). 
(b, b). 
(a, a) + (a, b) 
8 + 2 a 
2a 
(b, b) . 
1 + a 
1 + a 
n 
a — — . 
m 
if 
