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1 blocks not present in 1860 1861 1866 1869 1872; present in 1859
The face of Nature may be compared to a yielding surface, with ten thousand sharp wedges packed close together and driven inwards by incessant blows, sometimes one wedge being struck, and then another with greater force.

←Subtitle not present 1859 1860 1861 Nature of the Checks to Increase. 1866 1869 1872
The causes which 1860 1861 1866 1869 1872
What 1859

in number are 1860 1861
in number is 1859
are 1866 1869 1872

has 1859 1860 1861 1866 1869
of the checks to increase has 1872

discuss some of the checks 1859 1860 1861 1866 1869
to discuss it 1872

I believe that it is 1859 1860 1861 1866 1869
it appears that 1872

its life; that heavy destruction inevitably falls either on the young or old, during each generation or at recurrent intervals. Lighten any check, mitigate the destruction ever so little, and the number of the species will almost instantaneously increase to any amount.
The causes which
checks
check
the natural tendency of each species to increase in number are most obscure. Look at the most vigorous species; by as much as it swarms in numbers, by so much will
it tend
its tendency
to increase
be
be
still
further.
further
increased.
increased.
We know not exactly what the checks are
in
in
even
in a
one
single instance. Nor will this surprise any one who reflects how ignorant we are on this head, even in regard to mankind,
although so
so
incomparably better known than any other animal. This subject has been ably treated by several authors, and I
hope
shall,
in
a
my
future
work
work,
discuss some of the checks at considerable length, more especially in regard to the feral animals of South America. Here I will make only a few remarks, just to recall to the
readers
reader's
mind some of the chief points. Eggs or very young animals seem generally to suffer most, but this is not invariably the case. With plants there is a vast destruction of seeds, but, from some observations which I have
made
made,
I believe that it is the seedlings
which
which
suffer most from germinating in ground already thickly stocked with other plants. Seedlings, also, are destroyed in vast numbers by various enemies; for instance, on a piece of ground three feet long and two wide, dug and cleared, and where there could be no choking from other plants, I marked all the seedlings of our native weeds as they came up, and out of
the
the
357 no less than
295,
295
were destroyed, chiefly by slugs and insects. If turf which has long been mown, and the case would be the same with turf closely browsed by quadrupeds, be let to grow, the more vigorous plants