CuAP. V. HETBEOSTYXED DIMOEPHIC PLANTS. 23i 



varied much according to the season. I may premise, 

 as a standard of comparison, that during the same 

 years 56 flowers on legitimate long-styled plants of 

 the same age and grown in the same soil, were fer- 

 tilised with their own pollen, and yielded 27 capsules ; 

 that is, 48 per cent. On one of the five illegitimate 

 long-styled plants 36 flowers were self-fertilised in 

 the course of the three years, but they did not produce 

 a single capsule. Many of the anthers on this plant 

 were contabescent ; but some seemed to contain 

 sound pollen. Nor were the female organs quite 

 impotent; for I obtained from a legitimate cross one 

 capsule with good seed. On a second illegitimate 

 long-styled plant 44 flowers were fertilised during the 

 same years with their own pollen, but they produced 

 only a single capsule. The third and fourth plants 

 were in a very slight degree more productive. The 

 fifth and last plant was decidedly more fertile; for 

 42 self-fertilised flowers yielded 11 capsules. Alto- 

 gether, in the course of the three years, no less than 

 160 flowers on these five illegitimate long-styled 

 plants were fertilised with their own pollen, but they 

 yielded only 22 capsules. According to the standard 

 above given, they ought to have yielded 80 capsules. 

 These 22 capsules contained on an average 15 • 1 seeds. 

 I believe, subject to the doubts before specified, that 

 with legitimate plants the average number from a 

 union of this nature would have been above 20 seeds. 

 Twenty-four flowers on these same five illegitimate 

 long-styled plants were legitimately fertilised with 

 pollen from the above-described illegitimate short- 

 styled plant, and produced only 9 capsules, which is 

 an extremely small number for a legitimate union. 

 These 9 capsules, however, contained an average of 38 

 apparently good seeds, which is as large a number as 

 11 



