| → may formerly 1861 |
| whilst furnished with eyes, formerly may 1866 1869 |
| whilst they were furnished with eyes, may formerly 1872 |
|
| → have since (like the elephant on both continents) 1861 |
| since (like the elephant on both continents) have 1866 |
| then have 1869 1872 |
|
| → rain requisite for seeds to germinate, 1859 1860 1861 1866 1869 |
| sleep, 1872 |
|
| → sleep, 1859 1860 1861 1866 1869 |
| rain requisite for seeds to germinate, 1872 |
|
| → species of 1859 1860 1861 1866 1869 |
| distinct species belonging to 1872 |
|
| → and as I believe 1859 1860 1861 1866 |
| if it be true 1869 1872 |
|
| → parent, if this view be correct, 1859 1860 1861 1866 |
| parent-form, 1869 1872 |
|
| → long-continued 1859 1860 1861 1866 |
| a long course of 1869 1872 |
|
| → here enjoy good 1859 1860 1861 1866 |
| are here perfectly 1869 1872 |
|
| →may formerly
have ranged
over both continents, and
→have since (like the elephant on both continents)
become extinct, excepting in their present secluded
Far from feeling
surprise that some of the cave-animals should be very anomalous, as Agassiz has remarked in regard to the blind fish, the Amblyopsis, and as is the case with the blind Proteus with reference to the reptiles of Europe, I am only surprised that more wrecks of ancient life have not been preserved, owing to the less severe competition to which the
of these dark abodes
have been exposed. |
|
|
| Habit is hereditary with plants, as in the period of flowering, in the
of
→rain requisite for seeds to germinate,
in the
of
→sleep,
&c., and this leads me to say a few words on acclimatisation. As it is extremely common for
→species of
the same genus to inhabit
hot and
cold countries,
→and as I believe
that all the species of the same genus
descended from a single
→parent, if this view be correct,
acclimatisation must be readily effected during
→long-continued
descent. It is notorious that each species is adapted to the climate of its own home: species from an arctic or even from a temperate region cannot endure a tropical climate, or conversely. So again, many succulent plants cannot endure a damp climate. But the degree of adaptation of species to the climates under which they live is often overrated. We may infer this from our frequent inability to predict whether or not an imported plant will endure our climate, and from the number of plants and animals brought from
countries which
→here enjoy good
We have reason to believe that species in a state of nature are
in their ranges by the competition of other organic beings quite as much as, or
|
