→ 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
without requiring as a necessary compensation the reduction of some adjoining part. |
Multiple,
Rudimentary,
and
Lowly-organised
Structures
are
|
It seems to be a rule, as remarked by Is. Geoffroy St. Hilaire, both
varieties and
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
liable to
in structure.
→Inasmuch as this
"vegetative repetition," to use Prof.
expression,
→seems to be
a sign of low
the foregoing
→remark seems connected
with the
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
preserved or rejected each little deviation of form
carefully
when the part
to serve for
special
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
|