1065 
show all transitions of breadth from the common blue or white 
flax to the Egyptian. Individuals with petals as narrow as those of 
the narrow-petalled white flax would not occur, for as has been 
shown, this variety agrees in factors for broadness with the common 
blue and common white flax. Moreover there would be no difference 
between the blue and the white. The phenomena are, however, altered 
by the presence of the factor C by itself or of the factors B and C 
together. The blue offspring possesses B as well as C, the inhibiting 
action of C' is therefore removed and the blue individuals of /’, must 
show all transitions from the breadth of the common blue or white 
to that of the Egyptian flax. The narrowest blue offspring cannot 
therefore agree with the narrow-petalled /-variety, but with the 
common blue or white flax, the broadest must agree with the 
Egyptian as has indeed been observed. 
The white offspring of the crossing all possess the factor C only; the 
breadth in all individuals will therefore be less than if it were exclusively 
the result of the existing factors for broadness. They are not, however, 
all restricted to the factors for broadness of the narrow-petalled 
white flax, but some individuals even have the same factors for 
broadness as the Egyptian flax, others are intermediate with regard 
to the factors for broadness. Individuals, which have the same factors 
for broadness as the narrow-petalled white flax will agree also in 
breadth with this P-variety, because they, like it, have only the 
factor C. The individuals with the same factors for broadness as the 
Egyptian flax will, however, not have the type of broadness of this 
P-variety because of the presence of C, but they will be narrower. 
The white #-individuals together will show therefore a breadth 
ranging between the minimum of the narrow-petalled white and a 
breadth less than the maximum of the Egyptian flax. The afore- 
mentioned observations agree with this, the broadest white offspring 
from this crossing does not even reach the average of the Egyptian, 
hardly exceeds its minimum. 
The behaviour also in the third and following generations is seen 
to be in agreement with what has been discussed. A heterozvgotic 
blue plant of #,, with petals 13 mm. broad, produced blue offspring 
with a breadth of 9.1 to 14 mm. and white with a breadth of 7.4 
to 11.1 mm. Another narrower, heterozygotic blue /’,-individual 
with a breadth of 9 mm. produced blue plants in F, of 7 to 10.7 
mm. in breadth and white ones of 4 to 6.5 mm. The first broader 
F-plant had more factors for broadness than the second and this is 
also observable in the offspring, but in both cases the white /’, is 
narrower as a result of the influence of C. 
69* 
