208 BOTANICAL GAZETTE [MARCH 
per cent pure and 60+ per cent mixed. Of the 360 staminate 
plants 144 were pure in sexual expression and 216 mixed, or 40 
per cent pure and 60 per cent mixed. It will be noted that a much 
higher percentage of intermediates was obtained in the plantings 
of the winter of 1919~1920 than in the winter of 1918-1919. This is 
apparently due to the fact that the plants in 1919-1920 received the 
minimum amount of light, since the plantings were made in 
November and December, instead of in January and February. 
Plots 11 and 12 show the greatest degree of reversal of sex, and 
these plots were planted on December 19 in the north side room of 
the greenhouse which receives the minimum amount of light and 
was also kept at a lower a esac 
TABLE III 
CARPELLATE PLANTS STAMINATE PLANTS 
PLOT NO. 
Pure Mixed Pure Mixed 
Beek aes 60 54 75 57 
Bev 8 23 30 19 20 
Boece es ues 25 19 12 20 
PRA GR eats ig 19 24 5 20 
OL Oe Se ee 7 “16 13 17 
ch Nee rg FOUR ate arr 2 16 2 II 
Loe ie ase 4 og? 4 13 
RFit. a ce 17 26 9 22 
ECO Gira: TO 37 5 18 
20th acs. 167 254 144 216 
The ratios of plot 11 are as follows: carpellate individuals, 
11+ per cent pure carpellate and 88+ per cent intermediates; 
staminate individuals, 15+ per cent pure staminate and 84+ per 
cent intermediates. Taking the two plots together the ratio is 11+ 
per cent pure carpellate to 88+ per cent intermediate carpellate, 
and 20 per cent pure staminate to 80°per cent intermediate stam- 
inate. It is probable that if these plants had been more carefully 
spaced and cared for, every individual, both staminate and car- 
pellate, would have developed both sexual states sooner or later. 
It will be noted that the plants of plots 8-14 had two generations 
of known sporophyte ancestors which had shown no confusion of 
sex. Plots 3, 4, 5, 6, and 7 had pure sporophyte parents, but plots 
