327 
Table 1. 
Reference No. 
Normal 
fertile 
Normal 
sterile 
Cretin 
fertile 
Cretm 
sterile 
■XT " 
No. 0 
1909 
51 
29 
33 
1 
26 
14 
10 
1 
no 
;> 
21 
12 
12 
1 
lA 
V *^ 
24 
9 
8 

22 
4 
4 
2 
30 
12 
5 
1 
77 
78 
43 
32 
3 
„ 78 
59 
15 
24 
25 
12 
15 
2 
Total 
336 
150 
143 
11 
Exp 
ectation 
330 
150 
150 
10 
Table IL 
Gametic series 
-No. of 
gametes 
in series 
No. of 
zygotes 
formed 
Nature of zygotic series 
AB 
Ab 
aB 
ab 
AB 
Ab 
aB 
ab 
o o 
1 
(n-1) 
(n-1) 
1 
2n 
4n2 
C2n2H-l) 
(n^^-1) 
(n2_l) 
1 
— i =4H 
1 
31 
31 
1 
64 
4096 
2049 
1023 
1023 
1 
0 S V 
1 s 
1 
15 
15 
1 
32 
1024 
513 
255 
255 
1 
1 
7 
7 
1 
16 
256 
129 
63 
63 
1 
1 
3 
3 
1 
8 
64 
33 
15 
15 
1 
1 
1 
1 
1 
4 
16 
9 
3 
3 
1 
a ^ 
3 
1 
1 
3 
8 
64 
41 
7 
7 
9 
t4-( ^ 
7 
1 
1 
7 
16 
256 
177 
15 
15 
49 
S 
15 
1 
1 
15 
32 
1024 
737 
31 
31 
225 
cour 
^for 
31 
1 
1 
31 
64 
4096 
3009 
63 
63 
961 
tial 
te oi 
63 
1 
1 
63 
128 
16384 
12161 
127 
127 
3969 
t-c o 
•~ to 
P-> >^ 
S) 
(n-1) 
1 
1 
(2-1) 
2n 
4n2 
(2n-l) 
(2n-l) 
l.3-(2ll-l) 
These records (Table I) shew that the appearance of a small 
Proportion of sterile cretins is a constant featiire in those families 
and we suggest that their presence may be accounted for as 
follows. The repiilsion between N and F is to be regarded as 
partial, and of such a nature that the series of gametes })r()(liu ed 
by the Fi plant is NF : 3 Nf : 3 nF : nf. 
Such a series of ovules fertilised by a .siniihir series of 
pollen grains would give rise to a generation eonsistiiiLT <'f 
33 normal fertiles, 15 normal steriles, 15 vvcüu tertilc-. aml 
