Insect life: Souvenirs of a naturalist — John Shaqi
Insect life: Souvenirs of a naturalistFabre, Jean-Henri
Science
Insect life: Souvenirs of a naturalist
Fabre, Jean-Henri
Insects -- Biology
So far the insect has only raw material, put together anyhow. The first
thing to do is to select very carefully, taking what is most delicate
for the inner layers, upon which the larva will feed, and the coarser
for the outer ones which merely serve as a protecting shell. Then
around a central hollow which receives the egg the materials must be
arranged layer after layer, according to their decreasing fineness and
nutritive value; the strata must be made consistent and adhere one to
another; and finally, the bits of fibre in the outside crust, which has
to protect the whole thing, must be felted together. How can the
Scarabæus, clumsy and stiff as it seems, accomplish such a work in
complete darkness, at the bottom of a hole so full of provisions that
there is barely room to move? When I think how delicate is the work
done and how rude the tools of the workman,—of the angular feet fitted
to hollow the ground, and, if need be, even tufa,—I am reminded of an
elephant trying to make lace. Explain who can this miracle of maternal
industry; I give it up, especially as it has not been my good fortune
to see the artist at work. Let us restrict ourselves to describing this
masterpiece.
The ball which contains the egg is generally as large as a middle-sized
apple. In the midst is an oval cavity about a centimetre in diameter.
At the bottom is the egg, fixed vertically; it is cylindrical, rounded
at each end, yellowish-white, about as large as a grain of wheat, but
shorter. The wall of the hollow is washed over with a greenish-brown,
semi-fluid matter, manure cream, destined as the first food of the
larva. Does the mother collect the quintessence of the dung to make
this delicate food? The look of it tells me that it is a pap prepared
in the maternal stomach. The pigeon softens grain in its crop, and
turns it into a kind of milk food which it disgorges for its nestlings.
It would seem that the beetle shows the same tender care. It half
digests the choice food, and disgorges it in the shape of a delicate
film to line the walls of the cavity where the egg is laid. Thus, when
first hatched, the larva finds food easy of digestion, which rapidly
strengthens its stomach and allows it to attack the under layers which
lack the same refinement of preparation. Under the semi-fluid paste is
a choice pulp, compact and homogeneous, whence every particle of fibre
is banished. Beyond are the coarser strata where vegetable fibres
abound, and finally the outside of the ball is composed of the coarsest
materials felted together into a resistant shell. Manifestly there is a
progressive change of diet. On issuing from the egg the feeble grub
licks the fine paste on the walls of its dwelling. There is but little
of it, still it is strengthening and of high nutritious value. To the
bottle of early infancy succeeds the pap of the weanling, intermediate
between the dainty fare of the start and the coarse nourishment at the
end.
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