| → we can see that 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → he finds that 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → 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 |
|
| → the sexes of 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → on the land there are some hermaphrodites, as 1859 1860 1861 1866 1869 |
| various terrestrial species are hermaphrodites, such as the 1872 |
|
| → case of a 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → We can understand 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → on 1859 1860 1861 1866 1869 |
| is intelligible on 1872 |
|
| → by considering the medium in which terrestrial animals live, and 1859 1860 1861 1866 1869 |
| for owing to 1872 |
|
| → for we know of 1859 1860 1861 1866 1869 |
| there are 1872 |
|
| → in the case of 1859 1860 1861 1866 1869 |
| with 1872 |
|
| → currents in the 1859 1860 1861 1866 1869 |
| the currents of 1872 |
|
|
to flower on the same
and
flowers on the same tree can be considered as distinct individuals only in a limited sense. I believe this objection to be valid, but that nature has largely provided against it by giving to trees a strong tendency to bear flowers with separated sexes. When the sexes are separated, although the male and female flowers may be produced on the same tree,
→we can see that
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
me that
→he finds that
the rule does not hold
→in Australia; and
I have made these few remarks on
→the sexes of
trees simply to call attention to the subject. |
|
| Turning for a
brief space to animals:
→on the land there are some hermaphrodites, as
land-mollusca and earth-worms; but these all pair. As yet I have not found a single
→case of a
terrestrial animal which
itself.
→We can understand
remarkable fact, which offers so strong a contrast with terrestrial plants,
→on
the view of an occasional cross being
→by considering the medium in which terrestrial animals live, and
the nature of the fertilising
→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.
in the case of flowers, I have as yet
|
