| Comparison with 1860 |
|
membranous diaphragm over the mouth of the shell, might be floated in chinks of drifted timber across moderately wide arms of the sea. And I found
that several species did
in this state withstand
uninjured an immersion in sea-water during seven days: one of these shells was
the Helix pomatia, and
after it had
again hybernated
I
put
it in | it in 1859 1860 1861 | | it into 1866 | | into 1869 1872 |
| 6 blocks not present in 1859 1860 1861; present in 1866 1869 1872 | | During this length of time it
might have been carried by a marine current,
running at an average rate,
to a distance of 660 geographical miles.
As this Helix has a thick calcareous operculum, I removed it, and when it had formed a new membranous one, I again immersed it for fourteen days in sea-water, and it
recovered and crawled away.
Baron Aucapitaine has recently
tried similar experiments:
he placed 100 land-shells, belonging to ten species, in a box pierced with holes, and immersed it for a fortnight in the sea.
Out of the hundred shells, twenty-seven recovered.
The presence of an operculum seems to have been of importance, as out of twelve specimens of Cyclostoma elegans, which is thus furnished, eleven revived.
It is remarkable, seeing how well Helix pomatia
with me resisted the
salt-water, that not one out
of fifty-four specimens belonging to four species
of Helix tried by Aucapitaine, recovered.
|
| 1 blocks not present in 1859 1860 1861 1866; present in 1869 1872 | | It is, however, not at all probable that land-shells have often been thus transported; the feet of birds is
a more probable method.
|
| Subtitle not present 1859 1860 1861 |
| On
the
Relations
of
the
Inhabitants
of
Islands
to
those
of
the
nearest
Mainland
.
1869 1872 |
|
The most striking and important fact for us
in regard to the inhabitants of islands, is their affinity | in regard to the inhabitants of islands, is their affinity 1859 1860 1861 |
| in regard to islands, is the affinity 1866 |
| is the affinity of the species which inhabit islands 1869 1872 |
| to 1859 1860 1861 1869 1872 |
| of their inhabitants to 1866 |
| fact. 1859 1860 | | law. 1861 1866 | fact. 1869 1872 |
|
membranous diaphragm over the mouth of the shell, might be floated in chinks of drifted timber across moderately wide arms of the sea. And I
found | found 1859 1860 1861 1866 1869 | | find 1872 |
| did 1859 1860 1861 1866 | did 1869 1872 |
| withstand 1859 1860 1861 1866 1872 | | withstood 1869 |
| of these shells was 1859 1860 1861 1866 |
| shell, 1869 1872 |
| and 1859 1860 1861 1866 | and 1869 1872 |
| it had 1859 1860 1861 1866 |
| having been thus treated and 1869 1872 |
| hybernated 1859 1860 1861 1866 | | hybernating 1869 1872 |
| I 1859 1860 1861 1866 | | was 1869 1872 |
| it into 1866 | | it in 1859 1860 1861 | | into 1869 1872 |
| it 1859 1860 1861 1866 | it 1869 1872 |
| it 1866 | | the shell 1869 1872 |
| current, 1866 | | current 1869 1872 |
| running at an average rate, 1866 |
| of average swiftness, 1869 1872 |
| it 1866 | | again it 1869 1872 |
| recently 1866 1869 | | since 1872 |
| experiments: 1866 1872 | | experi- ments: 1869 |
| Helix pomatia 1866 |
| the Helix pomatia resisted 1872 |
| OMIT 1869 |
| resisted the 1866 |
| the Helix pomatia resisted the 1869 |
| the 1872 |
| species 1866 1869 | | other species 1872 |
| 1 blocks not present in 1866 1869 1872; present in 1859 1860 1861 | | As this species has a thick calcareous operculum, I removed it, and when it had formed a new membranous one, I immersed it for fourteen days in sea-water, and it recovered and crawled away: but more experiments are wanted on this head.
|
|
| On
the
Relations
of
the
Inhabitants
of
Islands
to
those
of
the
nearest
Mainland
. |
The most striking and important fact for us
in regard to islands, is the affinity | in regard to islands, is the affinity 1866 |
| in regard to the inhabitants of islands, is their affinity 1859 1860 1861 |
| is the affinity of the species which inhabit islands 1869 1872 |
| of their inhabitants to 1866 |
| to 1859 1860 1861 1869 1872 |
| same 1859 1860 1861 1866 | | same. 1869 1872 |
| species. 1859 1860 1861 1866 | species. 1869 1872 |
| given 1859 1860 1861 1866 | | given. 1869 1872 |
| of 1859 1860 1861 1866 | of 1869 1872 |
| this 1859 1860 1861 1866 | this 1869 1872 |
| law. 1861 1866 | | fact. 1859 1860 | law. 1869 1872 |
| I will give only one, that of the 1859 1860 1861 1866 |
| The 1869 1872 |
| between 1859 1860 1861 1866 |
| lies at the distance of between 1869 1872 |
|
