| → by the parasitic habits 1859 1860 1861 1866 1869 |
| would be a decided advantage to each successive individual 1872 |
|
| → Proteolepas, though effected by slow steps, would be a decided advantage to each successive individual of the 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
| → in reducing and saving every 1859 1860 1861 1866 1869 |
| to reduce any 1872 |
|
| → 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 |
|
|
attached to the bases of the prehensile antennæ. Now the saving of a large and complex structure, when rendered
→by the parasitic habits
of the
→Proteolepas, though effected by slow steps, would be a decided advantage to each successive individual of the
species; for in the struggle for life to which every animal is exposed, each
would have a better chance of supporting itself, by less nutriment being
|
|
| Thus, as I believe, natural selection will
in the long run
→in reducing and saving every
part 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
|
