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1859
1860
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these same 1861 1866 1869
some of these same 1872

under the present state of science, 1861 1866
OMIT 1869 1872

creation of 1861 1866
appearance or creation of only 1869 1872

or of 1861 1866
of life, or of 1869 1872

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

the
mothers
mother's
womb? Undoubtedly these same questions cannot be answered by those
who
who,
under the present state of science, believe in the creation of a few
aboriginal
aboriginal
forms
forms,
or of some one form
alone.
of life.
It has been
maintained
asserted
by several authors that it is as easy to believe in the creation of a
hundred
hundred
million beings as of one; but Maupertuis'
philo- sophical
philosophical
axiom "of least action" leads the mind more willingly to admit the smaller number; and certainly we ought not to believe 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
sub-ordinate
subordinate
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