Many flowering plants produce honey. This is said by some botanists to
have been directly caused by natural selection, because the honey
attracts insects. Possibly those who take up this attitude are putting
the cart before the horse. It is probable that honey, like oxygen, is an
ordinary product of the metabolism of the plant, and that the visits of
bees and other insects to such plants are the result rather than the
cause of the honey being there. Boisier found that some plants, for
example, _Potentilla tormentilla_ and _Geum urbanum_, gave honey in
Norway, but very little near Paris.
He further discovered that by supplying certain plants copiously with
water he could induce them to produce more than their normal output of
honey.
As is their habit, Neo-Darwinians have pushed their pet theory to absurd
lengths in its application to flowers. They assert that the visits of
insects are responsible for not merely the general colour of every
flower, but also the various lines, spots, and other markings of flowers.
The lines that frequently occur on the petals are supposed to guide the
insects to the honey! This particular refinement of Neo-Darwinism, to
quote Kay Robinson, “needs little discussion. Insects have very poor
sight. You can see this when a bee or a butterfly flies bang against a
whitewashed wall; when a wasp pounces upon a black spot on a sunlit
floor, mistaking it for a fly; or when a settled dragon-fly will allow
you to poke it in the face with the end of a walking-stick, although it
will be off like a flash if you raise your arm. There is, therefore,
large reason to doubt whether insects can even see the fine lines in the
throats of flowers which are supposed to guide them to the nectar. It is
rather absurd, too, to suppose that such lines can be needed, since
insects come in swarms to inconspicuous and apparently scentless flowers
or to ‘sugared’ tree-trunks in the dark. Where there is nectar, insects
which have come to the feast from a distance need no pencilled lines to
guide them over the last quarter of an inch of their journey.”
Scents of Flowers
Neo-Darwinians further assert that the scents of flowers have been
developed by natural selection because they serve to attract insect
visitors to the flowers. In support of this contention it is urged that
the most highly scented flowers are not usually the most conspicuous
ones, since it is not necessary for a flower to be both highly coloured
and strongly scented. Again, those flowers which open at night are
usually very highly scented.
Plausible though this view seems, there are weighty objections to it.
These are so admirably summarised by Kay Robinson in the issue of _The
Country-Side_ for March 27, 1909, that we feel we cannot do better than
reproduce his words:—
Public-domain text, read in full here on John Shaqi.
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