282 BOTANICAL GAZETTE [APRIL 
from a long-styled flower on all 5 stigmas of a long-styled flower 
on a separate plant. After 19 hours the stigmas were dissected 
and only a single pollen grain had emitted a tube. The pollen 
proved to be good when placed on the stigma of a short-styled 
plant. This experiment was repeated three times, with uniform 
results. A similar condition has been shown to occur in Lythrum 
Salicaria by STRASBURGER (34, p. 82). In this plant illegitimate 
pollination resulted in only a very slight growth of the pollen tube. 
Physiological differences appear also in ways which less directly 
affect fertilization. In the long-styled form of Linum perenne 
(DARWIN, II, p. 130), each separate stigma rotates on its own axis 
when the flower is mature, thus turning its papillose surface out- 
ward. This movement is confined to the long-styled form. In 
Faramea the stamens of the short-styled form rotate on their axes. 
No such motion is found in the stamens of the long-styled form. 
Darwin’s experiments on the inheritance of heterostyly, like 
those of the other earlier workers, do not give very uniform results. 
But he deduces the general laws that seeds from illegitimate unions 
tend to reproduce the parent form (p. 271), and that illegitimate 
unions of long-styled plants tend to transmit the parent form more 
truly than do those of short-styled plants. 
Recently, BATESON and GREGORY (2) have experimented on the 
inheritance of heterostyly in Primula. They find that in Primula 
sinensis the inheritance follows the Mendelian type, the short style 
being the dominant character and the long style the recessive. 
Short-styled plants are then heterozygotes, and half their gametes 
bear the dominant character, the other half the recessive; while 
long-styled plants are homozygotes and all their gametes bear the 
recessive character. One remarkable exception, however, was 
found. This was a single short-styled plant in which the female 
gametes were normal, that is, half bore the dominant and half the 
recessive character, while the male gametes bore the dominant 
character almost exclusively. BATESON and GREGORY note, as 
did DARwiy, that about half the eggs are fertilized by illegitimate 
pollen, while the rest are not; and suggest that this may be due 
to a differentiation of the egg cells of the plants. 
ERRERA (13) has pointed out that Primula elatior shows what 
