1909—1 0. ] The Significance of the Correlation Coefficient, etc. 
admitting of two fourfold divisions, namely : — 
479 
B. 
25 
11 
11 
17 
57 
3 
3 
1 
The former of these gives 
and the latter 
r= 45, 
r = ‘45, 
both values much in excess of the 333 given by the product method. 
When the three pairs are involved we have : — 
Parent. 
Offspring. 
1 
Three Pairs. 
Two Pairs. 
One Pair. 
None. 
Three pairs 
125 
75 
15 
1 
Two pairs . 
75 
105 
33 
3 
One pair 
15 
33 
21 
3 
N one . 
1 
| 
3 
3 
1 
This form is capable of three different fourfold divisions, namely : — 
A. r = -42, 
B. r= *42, 
C. r=- 45. 
10. It is evident that when two and three pairs of zygotes are con- 
densed we do not go straight back to the normal distribution. The reason 
of this is that the normal surface obtained when the elements are con- 
sidered separately, represents something different from the surface which 
is condensed into the last tables. 
