332 LOCK : STUDIES IN PLANT BREEDING 
All the offspring of (w) plants produced white flowers 
only. Of the offspring of (p) plants, eight families produced 
coloured flowers only, and twenty-one families included 
plants with white and plants with coloured flowers. Among 
the offspring of (f) plants four families produced coloured 
flowers only, four families included both types. 
The seeds of the offspring of the above (F 2 ) plants were 
also examined, namely, those of 803 (F 3 ) plants in all. 
(a) Offspring of (p) plants :—■ 
The offspring of 15 plants included 165 (p), 55 (f), 71 (w). 
5 77 (p), 26(f). 
„ 6 -, 88 (p), 26 (w). 
„ 3 ,, 55 (p) only. 
(5) Offspring of (f) plants :— 
The offspring of 4 plants included 66 (f), 19 (w). 
„ 4 „ 56 (f) only. 
(c) Offspring of (w) plants :— 
The offspring of 7 plants included (w) only, altogether 
99 plants. 
These figures will be seen to be in very close agreement 
with the theoretical explanation already given. 
Of the above 44 (F 2 ) plants, 33 had inflated pods and 11 had 
constricted pods. The offspring of the latter in F ? 
included 179 plants all with constricted pods. 
Of the offspring of (F 2 ) plants with inflated pods twenty 
families included plants of both forms, namely, 295 plants 
with inflated and 77 with constricted pods; or 3*9: 1, 
Thirteen families included plants with inflated pods only, 
viz , 252 such plants. 
The difference of the ratio 3*9 : 1, from that of 3 : 1, 
considerably exceeds the probable error for a sample of 372 
individuals. A considerable number of plants in this 
generation ripened no pods at all owing to the bad weather, 
and it seems reasonable to suppose that the soft pods were 
