the male and female flowers may be produced on the same tree,
we can see that we can see that 1859 1860 1861 1866 1869 |
OMIT 1872 |
pollen must be regularly carried from flower to flower; and this will give a better chance of pollen being occasionally carried from tree to tree. That trees belonging to all Orders have their sexes more often separated than other plants, I find to be the case in this country; and at my request Dr. Hooker tabulated the trees of New Zealand, and Dr. Asa Gray those of the United States, and the result was as I anticipated. On the other hand, Dr. Hooker
has recently has recently 1859 1860 1861 1866 1869 | has recently 1872 |
informed informed 1859 1860 1861 1866 1869 | informs 1872 |
me that
he finds that he finds that 1859 1860 1861 1866 1869 |
OMIT 1872 |
the rule does not hold
in Australia; and in Australia; and 1859 1860 1861 1866 1869 |
good in Australia: but if most of the Australian trees are dichogamous, the same result would follow as if they bore flowers with separated sexes. 1872 |
I have made these few remarks on
the sexes of the sexes of 1859 1860 1861 1866 1869 |
OMIT 1872 |
trees simply to call attention to the subject. |
|
Turning for a
very very 1859 1860 1861 1866 1869 | very 1872 |
brief space to animals:
on the land there are some hermaphrodites, as on the land there are some hermaphrodites, as 1859 1860 1861 1866 1869 |
various terrestrial species are hermaphrodites, such as the 1872 |
land-mollusca and earth-worms; but these all pair. As yet I have not found a single
case of a case of a 1859 1860 1861 1866 1869 |
OMIT 1872 |
terrestrial animal which
fertilises fertilises 1859 1860 1861 1866 1869 | can fertilise 1872 |
itself.
We can understand We can understand 1859 1860 1861 1866 1869 |
OMIT 1872 |
this this 1859 1860 1861 1866 1869 | This 1872 |
remarkable fact, which offers so strong a contrast with terrestrial plants,
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
|