310 
Breeding Uocjjerimeuts with Foxgloves 
If we assume that absence of decomposition, (purple spots) is dominant and 
total decomposition (brown spots) recessive, and that the parents which produced 
white offspring were heterozygous dominants with respect to this character, we 
can compare the experimental result with the theoretical Mendelian expectation. 
Offspring 
(Heterozygous dominants) 
Observation 
Theoretical expectation 
Purple spots 
Brown spots 
Purple spots 
Brown spots 
X. C (2) (self-fertilize;!) 
I A. A (self -fertilized) 
XVa. ? X C(2) 
XVb. \G{2)<^xA^ 
XL (4$xC'(3)c? ... 
XIL \C(3) Q X A^ 
XIV. X C(2)(J 
XV. 1(7(2)$ x^cJ ... 
9 
26 
6 
0 
12 
1 
9 
6 
2 
7 
1 
1 
5 
0 
5 
2 
8-25 
24-75 
5- 25 
0-7.5 
12-75 
0-75 
10-50 
6- 00 
2- 75 
8-25 
1- 75 
0-25 
4-25 
0-25 
3- 50 
2- 00 
Totals 
69 
23 
69-00 
23-00 
The assumption as to the heterozygous nature of the parents is warranted by 
the consistency which is shown when a supposed heterozygous dominant is crossed 
with an undoubted homozygous dominant. Thus we have: 
Offspring 
Parentage 
Observation 
Theoretical 
expectation 
Purple 
Brown 
Purple 
Brown 
C (2) Heterozygous dominant 2 x (7(1) 
homozygous dominant (J 
C'(l) Homozygous dominant $ x 6' (2) 
heterozygous dominant (J 
10 
10 
0 
0 
10 
10 
0 
0 
Totals 
20 
0 
20 
0 
The fact that the observed result and the theoretical expectation in the above 
two tables should be identical may be regarded as somewhat accidental, but never- 
theless the agreement is rather striking. 
3. The Amount of Spotting on the inner Surface of the Flower. 
By means of the diagram already referred to the percentage area, with respect 
to the lower portion of the inside surface of the flower, covered by the spots was esti- 
mated in six ordinary zygomorphic flowers in each plant. This character appeared 
