120 BOTANICAL GAZETTE [FEBRUARY 
to develop the female organs as well as the male organs. STRAS- 
BURGER states that the development of the stamens in the diseased 
plants was correlated with an elongation of the floral axis between 
the calyx and corolla (a character peculiar to flowers of the male 
plants), and that not infrequently the infected plants gave the im- 
pression that they were males. On the other hand, the fibrovas- 
st 
eine 
Fic. 1.—Variation in percentages of females in 1 35 families of Lychnis dioica. 
cular system of the calyx in infected plants more nearly assumed the 
distinctive features of the normal female flowers. The appearance 
of this secondary female character may be as readily accounted for as 
the appearance of the female sex organs themselves, on the ground 
of modified dominance of the male or of the female character in 4 
heterozygous male. 
CorrENs has pointed out that the determination of sex ratios is 
quite a different matter from the determination of sex, and we must 
