| → their native countries. 1859 1860 1861 1866 |
| any country which they inhabited. 1869 1872 |
|
| → by 1859 1860 1861 |
| in England by 1866 1869 1872 |
|
| → advanced— 1859 1860 1861 |
| advanced — 1866 1869 |
| advanced, as proving that acclimatisation cannot be effected, 1872 |
|
| → was— as proving that acclimatisation cannot be effected! 1859 1860 1861 |
| was — as proving that acclimatisation cannot be effected! 1866 1869 |
| was! 1872 |
|
| → appeared to be 1859 1860 1861 |
| were 1866 1869 |
| are 1872 |
|
| → others. 1859 1860 1861 |
| others; and of this fact I have myself observed a striking instance. 1866 |
| others; and of this fact I have myself observed striking instances. 1869 1872 |
|
| → of the structure of various organs; 1859 1860 1861 1866 1869 |
| structure; 1872 |
|
| → of use and disuse 1859 1860 1861 1866 1869 |
| OMIT 1872 |
|
|
born with constitutions best adapted to
→their native countries. In treatises on many kinds of cultivated plants, certain varieties are said to withstand certain climates better than
this is
strikingly shown in works on
published in the United States, in which certain varieties are habitually recommended for the
and others for the southern
and as most of these varieties are of recent origin, they cannot owe their constitutional differences to habit. The case of the Jerusalem artichoke, which is never propagated
→by
seed, and of which consequently new varieties have not been produced, has even been
→advanced—
for it is now as tender as ever it
→was— as proving that acclimatisation cannot be effected! The
also, of the kidney-bean has been often cited for a similar purpose, and with much greater weight; but until some one will sow, during a score of generations, his kidney-beans so early that a very large proportion
destroyed by frost, and then collect seed from the few survivors, with care to prevent accidental crosses, and then again get seed from these seedlings, with the same precautions, the experiment cannot be said to have been
tried. Nor let it be supposed that
differences in the constitution of seedling kidney-beans
appear, for an account has been published how much more hardy some seedlings
→appeared to be
than
→others.
|
|
| On the whole,
we may conclude that habit,
and disuse, have, in some cases, played a considerable part in the modification of the
and
→of the structure of various organs;
but that the effects
→of use and disuse
have often been largely combined with, and sometimes overmastered
the natural selection of innate
|
