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is rendered 1859 1860 1861 1866 1869
becomes, through changed habits, 1872

by changed habits of life superfluous, 1866 1869
superfluous, 1859 1860 1861 1872

structure of the 1859 1860 1861 1866 1869
OMIT 1872

number of the 1859 1860 1861 1866 1869
OMIT 1872

and 1859 1860 1861 1866 1869
as well as 1872

Inasmuch as this 1859 1860 1861 1866 1869
As 1872

seems to be 1859 1860 1861 1866 1869
is 1872

remark seems connected 1859 1860 1861 1866 1869
statements accord 1872

low 1859 1860 1861 1866 1869
which stand low 1872

in this case 1859 1860 1861 1866 1869
here 1872

purpose had better 1869
object had better 1859 1860 1861 1866
purpose must 1872

of the organisation, as soon as it is rendered by changed habits of life superfluous, without by any means causing some other part to be largely developed in a corresponding degree. And, conversely, that natural selection may perfectly well succeed in largely developing
an
any
organ
organ,
without requiring as a necessary compensation the reduction of some adjoining part.
Multiple, Rudimentary, and Lowly-organised Structures are
Variable .
Variable .
It seems to be a rule, as remarked by Is. Geoffroy St. Hilaire, both
with
in
varieties and
in
in
species, that when any part or organ is repeated many times in the structure of the same individual (as the vertebræ in snakes, and the stamens in polyandrous flowers) the number is variable; whereas the number of the same part or organ, when it occurs in lesser numbers, is constant. The same author and some botanists have further remarked that multiple parts are
extremely
also very
liable to
vary
variation
in structure. Inasmuch as this "vegetative repetition," to use Prof.
Owen's
Owens
expression, seems to be a sign of low
organisation;
organisation,
the foregoing remark seems connected with the
common
very general
opinion of naturalists, that beings low in the scale of nature are more variable than those which are higher. I presume that lowness in this case means that the several parts of the organisation have been but little specialised for particular functions; and as long as the same part has to perform diversified work, we can perhaps see why it should remain variable, that is, why natural selection should
have
not have
preserved or rejected each little deviation of form
less
so
carefully
than
as
when the part
has
had
to serve for
some one
one
special
purpose.
purpose
alone.
alone.
In the same way that a knife which has to cut all sorts of things may be of almost any shape; whilst a tool for some particular purpose had better be