I2O 



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- 



/> 



_T 



i 



"L 



FIG. i. "Variation in percentages of females*in 135 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 a 

 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 



