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1 blocks not present in 1861 1866 1869 1872; present in 1859 1860
Although naturalists very properly demand a full explanation of every difficulty from those who believe in the mutability of species, on their own side they ignore the whole subject of the first appearance of species in what they consider reverent silence.

fall away 1859 1860 1861 1866 1869
in favour of community of descent become fewer in number and less 1872

groups. 1859 1860 1861 1866 1869
groups. Fossil remains sometimes tend to fill up very wide intervals between existing orders. 1872

an embryonic 1859 1860 1861 1866
a very early 1869 1872

class. 1859 1860 1861 1866 1869
great class or kingdom. 1872

OMIT 1861 1866 1869 1872
germinal vesicles, their 1859 1860

their liability to injurious influences. 1861 1866 1869 1872
reproduction. 1859 1860

that innumerable beings within each great class have been created with plain, but deceptive, marks of descent from a single parent.
It may be asked how far I extend the doctrine of the modification of species. The question is difficult to answer, because the more distinct the forms are which we
may
may
consider, by so much the arguments fall away in force. But some arguments of the greatest weight extend very far. All the members of whole classes
are
can be
connected together by
a chain
chains
of affinities, and all can be
classed
classified
on the same principle, in groups
subordinate
sub-ordinate
to groups. Fossil remains sometimes tend to fill up very wide intervals between existing orders. Organs in a rudimentary condition plainly show that an early progenitor had the organ in a fully developed
condition;
state;
and this in some
instances
cases
instances necessarily
implies an enormous amount of modification in the descendants. Throughout whole classes various structures are formed on the same pattern, and at an embryonic age the
embryos
species
closely resemble each other. Therefore I cannot doubt that the theory of descent with modification embraces all the members of the same class. I believe that animals
are
have
descended from at most only four or five progenitors, and plants from an equal or lesser number.
Analogy would lead me one step
further,
farther,
namely, to the belief that all animals and plants
are
have
descended from some one prototype. But analogy may be a deceitful guide. Nevertheless all living things have much in
common,
common,—
in their chemical composition, their OMIT cellular structure,
and
....
their laws of
growth
growth,
and their liability to injurious influences. We see this even in so trifling a
fact
circumstance
as that the same poison often similarly affects plants and animals; or that the poison secreted by the
gallfly
gall-fly
produces monstrous growths on the wild