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1859
1860
1861
1866
1869
1872

Compare with:
1860
1861
1866
1869
1872

raised. 1859 1860 1861 1866
raised by the latter process. 1869
raised in the latter than in the former case. 1872

as 1859 1860 1861 1866 1869
though in a very slight degree, as do the 1872

differ from each other, 1859 1860 1861 1866 1869
OMIT 1872

thus, 1859 1860 1861 1866 1869
is thus striving, 1872

is striving its 1859 1860 1861 1866 1869
to the 1872

We can clearly
discern
see
this in the case of animals with simple habits. Take the case of a carnivorous quadruped, of which the number that can be supported in any country has long ago arrived at its full average. If its natural
power
powers
of increase be allowed to act, it can succeed in increasing (the country not undergoing any change in
its
its
conditions) only by its varying descendants seizing on places at present occupied by other
animals;
animals:
some of them, for instance, being enabled to feed on new kinds of prey, either dead or alive; some inhabiting new stations, climbing trees, frequenting water, and some perhaps becoming less carnivorous. The more diversified in habits and structure the descendants of our carnivorous
animals
animal
become,
became,
the more places they
will
would
be enabled to occupy. What applies to one animal will apply throughout all time to all animals— that is, if they vary— for otherwise natural selection can
effect
do
nothing. So it will be with plants. It has been experimentally proved, that if a plot of ground be sown with one species of grass, and a similar plot be sown with several distinct genera of grasses, a greater number of plants and a greater weight of dry herbage can
thus
thus
be raised. The same has been found to hold good when
first
first
one variety and
then
then
several mixed varieties of wheat have been sown on equal spaces of ground. Hence, if any one species of grass were to go on varying, and
the
those
varieties were continually selected which differed from each other in
at all
at all
the same
manner,
manner
as distinct species and genera of
grasses,
grasses
differ from each other, a greater number of individual plants of this
species,
species
of grass,
of grass,
including its modified descendants, would succeed in living on the same piece of ground. And we
well
well
know that each species and each variety of grass is annually sowing almost countless
seeds:
seeds;
and thus, as it may be said, is striving its utmost to increase
in
its
num- bers.
number.
numbers.
Con-
Con-