| → it, 1869 1872 |
| himself, the flowers 1866 |
|
| → OMIT 1869 1872 |
| in our imaginary case: 1859 1860 1861 1866 |
|
| → they can, with a very little more trouble, 1859 1860 1861 1866 1869 |
| with a very little more trouble, they can 1872 |
|
| → it may be believed that under certain circumstances individual differences 1869 1872 |
| I can see no reason to doubt that an accidental deviation 1859 1860 1861 |
| it may be believed that an accidental deviation 1866 |
|
| → curvature or length 1869 1872 |
| size and form 1859 1860 1861 1866 |
|
| → OMIT 1869 1872 |
| body, or in the curvature and length of the 1859 1860 1861 1866 |
|
| → than others; and thus the communities to which they belonged would flourish and throw off many swarms inheriting the same peculiarities. 1869 1872 |
| and so have a better chance of living and leaving descendants. 1859 1860 1861 1866 |
|
| ↑ 1 blocks not present in 1869 1872; present in 1859 1860 1861 1866 |
| Its descendants would probably inherit a tendency to a similar slight deviation of structure.
|
|
| → in vain offer 1869 |
| offer in vain 1859 1860 1861 1866 1872 |
|
| → OMIT 1869 1872 |
| which had been bitten 1866 |
|
| → in the two kinds of clover, which 1866 1869 1872 |
| which 1861 |
|
|
to Asa Gray, in an
condition, or, as he expresses
→it,
are more or less diœciously polygamous. |
|
| Let us now turn to the nectar-feeding
→OMIT
we may suppose the
of which we have been slowly increasing the nectar by continued selection, to be a common plant; and that certain insects depended in main part on its nectar for food. I could give many
showing how anxious bees are to save
for instance, their habit of cutting holes and sucking the nectar at the bases of certain flowers, which
→they can, with a very little more trouble,
enter by the mouth. Bearing such facts in mind,
→it may be believed that under certain circumstances individual differences
in the
→curvature or length
of the
→OMIT
proboscis, &c.,
too slight to be appreciated by us, might profit a bee or other insect, so that
would be able to obtain
food more
→than others; and thus the communities to which they belonged would flourish and throw off many swarms inheriting the same peculiarities.
↑
The tubes of the
of the common red and incarnate clovers (Trifolium pratense and incarnatum) do not on a hasty glance appear to differ in length; yet the hive-bee can easily suck the nectar out of the incarnate clover, but not out of the common red clover, which is visited by humble-bees alone; so that whole fields of the red clover
→in vain offer
an abundant supply of precious nectar to the hive-bee. That this nectar is much liked by the hive-bee is certain; for I have repeatedly seen, but only in the autumn, many hive-bees sucking the flowers through holes
the base of the tube
→OMIT
by humble-bees. The
in the length of the corolla
→in the two kinds of clover, which
determines the visits of the
must be very trifling; for I have been
that when
red clover has been mown, the flowers of the second crop are somewhat smaller, and
|
