Comparison with 1860 |
|
on
the view of an occasional cross being indispensable,
by considering the medium in which terrestrial animals live, and
the nature of the fertilising element;
for we know of
no means, analogous to the action of insects and of the wind in the case of
plants, by which an occasional cross could be effected with terrestrial animals without the concurrence of two individuals. Of aquatic animals, there are many self-fertilising hermaphrodites; but here currents in the
water offer an obvious means for an occasional cross. And, as
in the case of flowers, I have as yet failed, after consultation with one of the highest authorities, namely, Professor Huxley, to discover a single case of an
hermaphrodite animal with the organs of reproduction so perfectly enclosed within the body,
that access from without
and the occasional influence of a distinct individual
can be shown to be physically impossible. Cirripedes long appeared to me to present
a case of very great difficulty
under this point of view;
but
I have been enabled, by a fortunate chance, elsewhere
to prove that two individuals, though both are self-fertilising hermaphrodites, do sometimes cross. |
|
It must have struck most naturalists as a strange anomaly that, in the case of both
animals and plants, species
of the same family and even of the same genus, though agreeing closely with each other in almost
their whole organisation, yet
are not rarely, some of them
hermaphrodites, and some of them
unisexual. But if, in fact, all hermaphrodites do occasionally intercross
with other individuals,
the difference between hermaphrodites
and unisexual species,
as
far as function is concerned, becomes
very small. |
|
From these several considerations and from the many special facts which I have collected, but which I am not
here able
to give,
I am strongly inclined to suspect that, both in the vegetable and animal kingdoms, I am strongly inclined to suspect that, both in the vegetable and animal kingdoms, 1859 1860 1861 |
I am strongly inclined to suspect, that, both in the vegetable and animal kingdoms, 1866 1869 |
it appears that with animals and plants 1872 |
an
|
on on 1859 1860 1861 1866 1869 |
is intelligible on 1872 |
the view of an occasional cross being
indispensable, indispensable, 1859 1860 1861 1866 1869 | indispensable; 1872 |
by considering the medium in which terrestrial animals live, and by considering the medium in which terrestrial animals live, and 1859 1860 1861 1866 1869 |
for owing to 1872 |
the nature of the fertilising
element; element; 1859 1860 1861 1866 1869 | element 1872 |
for we know of for we know of 1859 1860 1861 1866 1869 |
there are 1872 |
no means, analogous to the action of insects and of the wind
in the case of in the case of 1859 1860 1861 1866 1869 |
with 1872 |
plants, by which an occasional cross could be effected with terrestrial animals without the concurrence of two individuals. Of aquatic animals, there are many self-fertilising hermaphrodites; but here
currents in the currents in the 1859 1860 1861 1866 1869 |
the currents of 1872 |
water offer an obvious means for an occasional cross.
And, as And, as 1859 1860 1861 1866 1869 | As 1872 |
in the case of flowers, I have as yet failed, after consultation with one of the highest authorities, namely, Professor Huxley, to discover a single
case of an case of an 1859 1860 1861 1866 1869 |
OMIT 1872 |
hermaphrodite animal with the organs of reproduction so perfectly enclosed
within the body, within the body, 1859 1860 1861 1866 1869 |
OMIT 1872 |
that access from
without without 1859 1860 1861 1866 1869 | without, 1872 |
and the occasional influence of a distinct
individual individual 1859 1860 1861 1866 1869 | individual, 1872 |
can be shown to be physically impossible. Cirripedes long appeared to me to
present present 1859 1860 1861 1866 1869 | present, 1872 |
a case of very great difficulty a case of very great difficulty 1859 1860 1861 1866 1869 |
OMIT 1872 |
under this point of
view; view; 1859 1860 1861 1866 1869 | view, 1872 |
but but 1859 1860 1861 1866 1869 |
a case of great difficulty; but 1872 |
I have been enabled, by a fortunate chance,
elsewhere elsewhere 1859 1860 1861 1866 1869 | elsewhere 1872 |
to prove that two individuals, though both are self-fertilising hermaphrodites, do sometimes cross. |
|
It must have struck most naturalists as a strange anomaly that,
in the case of both in the case of both 1859 1860 1861 1866 1869 |
both with 1872 |
animals and plants,
species species 1859 1860 1861 1866 1869 | some species 1872 |
of the same family and even of the same genus, though agreeing closely with each other in
almost almost 1859 1860 1861 1866 1869 | almost 1872 |
their whole organisation,
yet yet 1859 1860 1861 1866 1869 | yet 1872 |
are
not rarely, some of them not rarely, some of them 1859 1860 1861 1866 1869 |
OMIT 1872 |
hermaphrodites, and some
of them of them 1859 1860 1861 1866 1869 | of them 1872 |
unisexual. But if, in fact, all hermaphrodites do occasionally
intercross intercross 1859 1860 1861 1866 1869 | intercross, 1872 |
with other individuals, with other individuals, 1859 1860 1861 1866 1869 |
OMIT 1872 |
the difference between
hermaphrodites hermaphrodites 1859 1860 1861 1866 1869 | them 1872 |
and unisexual
species, species, 1859 1860 1861 1866 1869 | species 1872 |
as as 1859 1860 1861 1866 1869 | is, as 1872 |
far as function is concerned,
becomes becomes 1859 1860 1861 1866 1869 | becomes 1872 |
very small. |
|
From these several considerations and from the many special facts which I have collected, but which I am
not not 1859 1860 1861 1866 1869 | unable 1872 |
here
able able 1859 1860 1861 1866 1869 | able 1872 |
to give,
I am strongly inclined to suspect, that, both in the vegetable and animal kingdoms, I am strongly inclined to suspect, that, both in the vegetable and animal kingdoms, 1866 1869 |
I am strongly inclined to suspect that, both in the vegetable and animal kingdoms, 1859 1860 1861 |
it appears that with animals and plants 1872 |
an
|