Inheritance of Mutation in the Common Foxglove. 59 
Table showing the proportion of type and variety in each of the 
F 2 families derived from the putative crossbreds by self-fertilisation 
or by crossing inter se. 
Number of 
individuals 
Reference number 
of family. 
Form of Union. 
in F 2 families. 
T yP e - 
Heptandra. 
7 
Crossbred x self 
33 
7 
8 
>> 
21 1 
8 3 
9 
15 
3 3 
10 
24 
5 
11 
>> 
13 
8 4 
12 
>> 
22 
5 
13 
>> 
14 
5 3 
14 
») 
9 
4 
15 
>> 
11 
1 
16 
Crossbred x sister 
crossbred 
21 
3 
Totals 
183 
49 
A ratio of 3: 1, calculated to the nearest whole number, would give 
173 type and 58 heptandra. 
1 Including one individual with a few abnormal flowers. 
2 Including two individuals with a few normal flowers. 
3 Including one individual with a few normal flowers. 
4 Including three individuals with some normal or nearly normal 
flowers. 
5 Including four individuals with some normal or nearly normal 
flowers. 
In the eight F 2 plants in which a slight abnormality in the 
first few (1-8) flowers was observed, the abnormality was in the 
form either of a lateral notch in the corolla edge, or of a longitudinal 
cleft which extended for a longer or shorter distance down one side. 
In other respects these flowers were normal as was also the whole 
of the rest of the spike. It is of interest to note that among the 
F 2 individuals classed as heptandra the proportion which eventually 
produced a few normal or nearly normal flowers was no higher, in 
one case rather fewer, when the heptandra form had been introduced 
twice into the pedigree than when the plants resulting from a first 
cross were self-fertilised or fertilised inter se. Thus the two cross¬ 
breds which produced plants of this grade when the breeding was 
in the form DR x R, yielded respectively four such plants in a total 
of twelve, and two in a total of nineteen, whereas on self-fertilisation 
the numbers obtained from these same crossbreds were respectively 
1 in 3 and 2 in 8. (See families 8, 9, 17, and 18). 
