214 Rhodora [ NoveMBER 
assert itself in some of the offspring; B may be simply B or Bb; it 
may be pure or hybrid. Accordingly, under form 3 above we may 
have either a.B. or a.Bb; under form 2either A.b or Aa.b; and 
under form 1 either A.B, A.Bb, Aa.B, or Aa.Bb. The fourth 
form, a.b, is without ambiguity. These possibilities are pictured in 
the following diagram, in which the latent hybridity is represented 
by small crosses on capsule or seed. 
STABLE 
FORMS. 
Average 
NY frequency: 
one plant 
of each in 
every 16. 
no.3, a.B no.4, 8.b 
MONO-HYBRID FORMS, 
each disguised under 
the form shown above it. 
Average frequency: 
2 plants of each 
in every 16. 
no.5., A.Bb—no.6, Aa.B no.7, Aa.b 
DI-HYBRID FORM, always disguised as A.B. 
Wi Average frequency: 4 plants in every 16. 
[| €» 
no.9, Aa.Bb 
Fig. 2.—Color Forms in Offspring of V. hirsutula X papilionacea. 
It will be seen at once that to determine the real nature of any one 
of the first three of the F,’s in fig. 1, we need to grow its seeds. The 
apparent forms of the six plants whose seeds were sown, and of their 
offspring, are given in the following table: 
Form of F, AB | AB | AB | Ab | &B | &b 
Seed-number |. 940 337 339 | 334 333 338 
; i ; lA.B-4 | A.B-4 | | 
Forms of F, obtained, ) | A b-4 AR 
and the number oft ,p | i B-3 | as 
plants of each form. J | | | &b-t | NU 
The plants raised from these six sowings were so few (largely from 
lack of time to transplant) that the numerical results are unimportant; 
