. 
Studies on the Variability and Heritability of Pigmentation in Oenothera. 347 
Table 5. 
O. rubrinervis, 14.2. October 5, 1907. 35 buds. 
0 I 2 3 SEN Sede lene 7 
3A xx | x x 
x 
2—3) (5—6) 
(2—3).4 | x — 
(2—3).4 XXX xx 
AIR, | 
x.4 x.4 (45) x 
x.4 _ x Rx 
x.4 | x(4—5) (4—5) x 
Kaa 
(2—3).4 
(2—3) - (4—5) | 
x.4 | x | 
5 (5) 8 (2) 10 (1) 4 
25 10.5 aed 60 See ee 
7-5 10.5 17 | 
several plants. Classes 4, 5 and 6 are summed into one class having 
the same extent of red color pattern. It will be seen that the mode 
falls in different classes in different individuals. 
I have shown that in the case of class 8 there is complete in- 
heritance except in certain individuals which revert to classes 2—5. 
It seems probable, however, that whatever inheritance there may be 
in classes o—7, it is not of the complete sort shown by class 8. The 
gap between classes 7 and 8, and the fact that class 8 does not regress 
gradually towards class 5 or 7, but either remains true or reverts 
completely to class 5 as a modal condition, shows clearly enough that 
class 8 belongs outside the series represented by classes 0—7. 
Omitting the fifty buds from the individual in class 8, a total of 
one thousand, four hundred and ten buds were examined in 1907, from 
one hundred and three different plants, the number of buds per indi- 
vidual varying from five to over fifty, but being chiefly fifteen to 
twenty. The results of treating all the buds as a single population, 
are given in table 1. The results do not represent a normal curve, 
but something nearer a half curve, for the buds really form a reduction 
series from class 4—5—6, with only an occasional increase to class 7. 
Since the results are not based upon accurate measurements and 
distribution into classes exactly equidistant from each other — a degree 
