| ↑ 1 blocks not present in 1866 1869 1872; present in 1859 1860 1861 |
| Again, we have many slight differences which may be called individual differences, such as are known frequently
to appear in the offspring from the same parents, or which may be presumed to have thus arisen, from being frequently observed in the individuals of the same species inhabiting the same confined locality.
|
|
| → highly 1859 1860 1861 1866 |
| of the highest 1869 1872 |
|
| → are often inherited, as must be familiar to every one; and thus they afford 1861 1866 |
| afford 1859 1860 |
| are often inherited, as must be familiar to every one; and they thus afford 1869 1872 |
|
| → act on and accumulate, 1866 1869 1872 |
| accumulate, 1859 1860 1861 |
|
| → it might have been thought 1861 1866 1869 1872 |
| I should have expected 1859 1860 |
|
|
Individual
Differences.
|
| ↑
The many slight differences which
appear in the offspring from the same parents, or which
be presumed
have thus arisen, from being
observed in the individuals of the same species inhabiting the same confined locality, may be called individual differences. No one supposes that all the individuals of the same species are cast in the
same
These individual differences are
→highly
for us,
they
→are often inherited, as must be familiar to every one; and thus they afford
materials for natural selection to
→act on and accumulate,
in the same manner as man
in any given direction individual differences in his domesticated productions. These individual differences generally affect what naturalists consider unimportant parts; but I could show by a long catalogue of facts, that parts which must be called important, whether viewed under a physiological or classificatory point of view, sometimes vary in the individuals of the same species. I am convinced that the most experienced naturalist would be surprised at the number of the cases of variability, even in important parts of structure, which he could collect on good authority, as I have collected, during a course of years.
should be remembered that systematists are far from
at finding variability in important characters, and that there are not many men who will laboriously examine internal and important organs, and compare them in many specimens of the same species.
never have
that the branching of the main nerves close to the great central ganglion of an insect would have been variable in the same species;
→it might have been thought
that changes of this nature could have been effected only by slow
yet
|
