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1859
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1872

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1859
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1872

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

flowers, it may be objected that pollen could seldom be carried from tree to tree, and at most only from flower to flower on the same
tree;
tree,
and
that
that
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
has recently
has recently
informs
informed
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
very
very
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
can fertilise
fertilises
itself. We can understand
This
this
remarkable fact, which offers so strong a contrast with terrestrial plants, on the view of an occasional cross being
indispensable;
indispensable,
by considering the medium in which terrestrial animals live, and the nature of the fertilising
element
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