Comparison with 1859 |
|
may,
I I 1859 1860 1861 1869 1872 | as I 1866 |
believe, be accounted for by
close close 1859 1860 1861 | too close 1866 1869 1872 |
interbreeding interbreeding 1859 1860 1861 1869 1872 | inter-breeding 1866 |
having been avoided. |
|
Now let us turn to the results arrived at by the
third most experienced hybridiser, namely, the Hon. and Rev. W. Herbert. He is as emphatic in his conclusion that some hybrids are perfectly
fertile— fertile— 1859 1860 1861 1872 | fertile—as 1866 1869 |
as as 1859 1860 1861 1872 | as 1866 1869 |
fertile as the pure
parent-species— parent-species— 1859 1860 1861 1872 | parent-species—as 1866 1869 |
as as 1859 1860 1861 1872 | as 1866 1869 |
are Kölreuter and Gärtner that some degree of sterility between distinct species is a universal law of nature. He
experimentised experimentised 1859 1860 | experimented 1861 1866 1869 1872 |
on some of the very same species as did Gärtner. The difference in their results may, I think, be in part accounted for by Herbert's great horticultural skill, and by his having hothouses
at his command. Of his many important statements I will here give only a single one as an example, namely, that "every ovule in a pod of Crinum capense fertilised
by C. revolutum produced a plant, which (he says)
I never saw to occur in a case of its natural fecundation." So that we here
have
perfect, perfect, 1859 1860 1861 | perfect 1866 1869 1872 |
or even more than commonly perfect,
fertility
in a first cross between two distinct species. |
|
This case of the Crinum leads me to refer to a most
singular fact, namely, that there are
individual
plants, plants, 1859 | plants 1860 1861 1866 1869 1872 |
as with as with 1859 | of 1860 1861 1866 1869 1872 |
certain species of
Lobelia, Lobelia, 1859 1869 1872 | Lobelia 1860 1861 1866 |
and with all the species of the genus Hippeastrum, which can be far more easily and with all the species of the genus Hippeastrum, which can be far more easily 1859 |
and of some other genera, which can be far more easily 1860 1861 1866 |
Verbascum and Passiflora, can easily be 1869 1872 |
fertilised by the
pollen of another and
distinct species,
than by their own pollen. than by their own pollen. 1859 |
than by their own pollen; and all the individuals of nearly all the species of Hippeastrum seem to be in this predicament. 1860 1861 1866 |
but not by pollen from the same plant, though this pollen can be proved to be perfectly sound by fertilising other plants or species. 1869 1872 |
↑1 blocks not present in 1859 1860 1861 1866; present in 1869 1872 | In the genus Hippeastrum, in Corydalis as shown by Professor Hildebrand, in various orchids as shown by Mr. Scott and Fritz Müller,
all the individuals are in this peculiar condition.
|
For these plants have been found to yield seed to the pollen of a distinct species, though quite sterile with their own pollen, notwithstanding that their own pollen was found to be perfectly good, for it fertilised distinct species. So that certain individual plants and
all the individuals
of certain species
can actually be hybridised much more readily than they can be
self-fertilised! self-fertilised! 1859 1860 1861 |
self-fertilised! For instance, a bulb of Hippeastrum au- licum produced four flowers; three were fertilised by Herbert with their own pollen, and the fourth was subsequently fertilised by the pollen of a compound hybrid descended from three other and distinct species: the result was that "the ovaries of the three first flowers soon ceased to grow, and after a few days perished entirely, whereas the pod impregnated by the pollen of the hybrid made vigorous growth and rapid progress to maturity, and bore good seed, which vegetated freely." 1866 |
fertilised by pollen from the same individual plant! 1869 1872 |
|
may, may, 1859 1860 1861 1866 |
in contrast with those spontaneously self-fertilised, may, as 1869 1872 |
as I as I 1866 | I 1859 1860 1861 1869 1872 |
believe, be accounted for by
too close too close 1866 1869 1872 | close 1859 1860 1861 |
inter-breeding inter-breeding 1866 | interbreeding 1859 1860 1861 1869 1872 |
having been avoided. |
|
Now let us turn to the results arrived at by
the the 1859 1860 1861 1866 | a 1869 1872 |
third most experienced hybridiser, namely, the Hon. and Rev. W. Herbert. He is as emphatic in his conclusion that some hybrids are perfectly
fertile—as fertile—as 1866 1869 | fertile— 1859 1860 1861 1872 |
....... 1866 1869 | as 1859 1860 1861 1872 |
fertile as the pure
parent-species—as parent-species—as 1866 1869 | parent-species— 1859 1860 1861 1872 |
....... 1866 1869 | as 1859 1860 1861 1872 |
are Kölreuter and Gärtner that some degree of sterility between distinct species is a universal law of nature. He
experimented experimented 1861 1866 1869 1872 | experimentised 1859 1860 |
on some of the very same species as did Gärtner. The difference in their results may, I think, be in part accounted for by Herbert's great horticultural skill, and by his having
hothouses hothouses 1859 1860 1861 1866 | hot-houses 1869 1872 |
at his command. Of his many important statements I will here give only a single one as an example, namely, that "every ovule in a pod of Crinum capense
fertilised fertilised 1859 1860 1861 1866 1869 | fertilized 1872 |
by C. revolutum produced a plant, which
(he says) (he says) 1859 1860 1861 1866 | (he says) 1869 1872 |
I never saw to occur in a case of its natural fecundation." So that
we here we here 1859 1860 1861 1866 | here we 1869 1872 |
have
perfect perfect 1866 1869 1872 | perfect, 1859 1860 1861 |
or even more than commonly
perfect, perfect, 1859 1860 1861 1866 1869 | perfect 1872 |
fertility fertility 1859 1860 1861 1866 1869 | fertility, 1872 |
in a first cross between two distinct species. |
|
This case of the Crinum leads me to refer to a
most most 1859 1860 1861 1866 | most 1869 1872 |
singular fact, namely, that
there are there are 1859 1860 1861 1866 | there are 1869 1872 |
individual
plants plants 1860 1861 1866 1869 1872 | plants, 1859 |
of of 1860 1861 1866 1869 1872 | as with 1859 |
certain species of
Lobelia Lobelia 1860 1861 1866 | Lobelia, 1859 1869 1872 |
and of some other genera, which can be far more easily and of some other genera, which can be far more easily 1860 1861 1866 |
and with all the species of the genus Hippeastrum, which can be far more easily 1859 |
Verbascum and Passiflora, can easily be 1869 1872 |
fertilised by
the the 1859 1860 1861 1866 | the 1869 1872 |
pollen
of another and of another and 1859 1860 1861 1866 |
from a 1869 1872 |
distinct species,
than by their own pollen; and all the individuals of nearly all the species of Hippeastrum seem to be in this predicament. than by their own pollen; and all the individuals of nearly all the species of Hippeastrum seem to be in this predicament. 1860 1861 1866 |
than by their own pollen. 1859 |
but not by pollen from the same plant, though this pollen can be proved to be perfectly sound by fertilising other plants or species. 1869 1872 |
↑1 blocks not present in 1859 1860 1861 1866; present in 1869 1872 | In the genus Hippeastrum, in Corydalis as shown by Professor Hildebrand, in various orchids as shown by Mr. Scott and Fritz Müller,
all the individuals are in this peculiar condition.
|
For these plants have been found to yield seed to the pollen of a distinct species, though quite sterile with their own pollen, notwithstanding that their own pollen was found to be perfectly good, for it fertilised distinct species. So that
certain individual plants and certain individual plants and 1859 1860 1861 1866 |
with some species, certain abnormal individuals, and in other species 1869 1872 |
all the
individuals individuals 1859 1860 1861 1866 | individuals, 1869 1872 |
of certain species of certain species 1859 1860 1861 1866 |
OMIT 1869 1872 |
can actually be hybridised much more readily than they can be
self-fertilised! For instance, a bulb of Hippeastrum au- licum produced four flowers; three were fertilised by Herbert with their own pollen, and the fourth was subsequently fertilised by the pollen of a compound hybrid descended from three other and distinct species: the result was that "the ovaries of the three first flowers soon ceased to grow, and after a few days perished entirely, whereas the pod impregnated by the pollen of the hybrid made vigorous growth and rapid progress to maturity, and bore good seed, which vegetated freely." self-fertilised! For instance, a bulb of Hippeastrum au- licum produced four flowers; three were fertilised by Herbert with their own pollen, and the fourth was subsequently fertilised by the pollen of a compound hybrid descended from three other and distinct species: the result was that "the ovaries of the three first flowers soon ceased to grow, and after a few days perished entirely, whereas the pod impregnated by the pollen of the hybrid made vigorous growth and rapid progress to maturity, and bore good seed, which vegetated freely." 1866 |
self-fertilised! 1859 1860 1861 |
fertilised by pollen from the same individual plant! 1869 1872 |
|