The reason why : $b a careful collection of many hundreds of reasons for things which, though generally believed, are imperfectly understood. A book of condensed scientific knowledge for the million
John Stuart Mill · en
Yet in beans, peas, grass-seeds, grain, fruits, it is so fenced
on all sides, so shut up and protected, that whilst the seed
itself is rudely handled, tossed into sacks, shovelled into heaps,
the sacred particle, the miniature plant remains unhurt. It is
wonderful, also, how long many kinds of seeds, by the help of
their integuments, and perhaps of their oils, stand out against
decay. A grain of mustard-seed has been known to lie in the earth
for a hundred years; and as soon as it had acquired a favourable
situation, to shoot as vigorously as if just gathered from the
plant. Then, as to the second point, the temporary support of
the future plant, the matter stands thus. In grain, and pulse,
and kernels, and pipins, the germ composes a very small part
of the seed. The rest consists of a nutritious substance, from
which the sprout draws its aliment for some considerable time
after it is put forth; viz., until the fibres, shot out from the
other end of the seed, are able to imbibe juices from the earth,
in a sufficient quantity for its demand. It is owing to this
constitution that we see seeds sprout, and the sprouts make a
considerable progress, without any earth at all.
[Verse: "Say not ye, There are four months, and then cometh harvest?
behold, I say unto you, Lift up your eyes, and look on the fields; for
they are white already to harvest."--JOHN IV.]
From the conformation of fruits alone, one might be led, even
without experience, to suppose, that part of this provision
was destined for the utilities of animals. As limited to the
plant, the provision itself seems to go beyond its object. The
flesh of an apple, the pulp of an orange, the meat of a plum,
the fatness of the olive, appear to be _more_ than sufficient
for the nourishing of the seed or kernel. The event shows, that
this redundancy, if it be one, ministers to the support and
gratification of animal natures; and when we observe a provision
to be more than sufficient for one purpose, yet wanted for another
purpose, it is not unfair to conclude that both purposes were
contemplated together.--_Paley._
1173. _Why have climbing plants tough curly tendrils?_
Because, _having no woody stalks of their own_ to support them, they
require to take hold of surrounding objects, and raise themselves from
the ground by climbing. Their spiral tendrils are, therefore, so many
hands, assisting them to rise from the earth.
1174. _Why does the pea put forth tendrils, and the bean not?_
Because the bean has in its stalk _sufficient woody fibre to support
itself_, but the pea has not. We do not know a single tree or shrub
having a firm strong stem sufficient for its support which is _also_
supplied with tendrils.
1175. _Why do the ears of wheat stand up by day, and turn down by
night?_