1921] SCHAFFNER—HEMP 207 
which a staminate flower was produced. One cannot tell, there- 
fore, whether a plant will continue “pure”? or whether it will 
reverse its sexual state until it actually begins to die. 
Sex intergrades and sex reversals 
Plots 2, 6, and 7 were planted out of doors under normal con- 
ditions. Not a single intermediate plant was developed, and not 
a sign of sexual confusion in the floral characters was found. Plots 
6 and 7 were studied with great care. No record was kept of the 
ratio between staminate and carpellate plants of plot 2. Plot 6 
had 124 carpellate and 122 staminate plants, all absolutely pure in 
sexual expression. Plot 7 had 86 carpellate and 83 staminate 
plants, all pure as to sexual expression. Plots 4, 5, 8, 9, 10, 11, 12, 
13, and 14 were studied for sex ratios and ratios of pure plants to 
those of mixed sexual expression. The numbers of carpellate to 
staminate plants in the greenhouse experiments, of which definite 
records were kept, are shown in table II. 
TABLE II 
Plot no. Carpellate plants Staminate plants 
i ae a hire Crue hye 73 77 
Be es a 114 132 
PRPS A pa NTE: 53 39 
Be 44 41 
Owe at a 43 34 
TOF ee aa 23 39° 
i 18 13 
Oe eee a 36 17 
167 teres 43 3t 
EELS 47 23 
Total: a5: 494 437 
The percentages of plants with mixed sexual expression to those 
of pure sexual expression are given in table III. The plants were 
removed as soon as they showed a definite reversal to the opposite 
sexual state, or if they had not reversed they were pulled up when 
they began to die. In the nine plots which were studied for 
purity, reversal, or mixed sexual characters, therefore, the following 
proportions were found. Out of a total of 421 carpellate plants 
167 were pure and 254 were of mixed sexual expression, or 39+ 
