Three or four months go by and, when the torrid heats of July have
come, the first tin gives me the perfect insect. Its development has
been accomplished without a check: the twelve grubs are succeeded by
twelve magnificent Cetoniæ, resembling at all points those who sip and
slumber in the roses when the spring comes. This result convinces me
that the defects attaching to rearing in confinement have nothing to do
with what remains to be told.
The second tin, in which strict abstinence is enforced, provides me
with two chrysalids, whose diminished size indicates the presence of
dwarfs. I wait until the middle of September to open these caskets,
which remained closed when those in the first tin burst, two months
ago. Their persistent refusal to split open is explained: each of them
contains nothing but a dead larva. Absolute starvation was too much for
the grubs’ endurance. Of the twelve kept without food, ten shrivelled
up and eventually died; only two managed to wrap themselves in a shell,
by gluing the droppings round about in the usual way. This was their
last effort. The two grubs, incapable of performing the consummate
labour of the nymphosis, perished in their turn.
Lastly, in the third tin, where victuals were very sparingly provided,
eleven grubs out of twelve died, worn out with privation. One only has
enclosed itself in a cocoon, which is correctly made but very much
reduced in size. If there is a living insect within, it can only be a
dwarf. In the middle of September, I open the cabin myself, for there
is nothing yet, at this late period, to announce an impending natural
fracture.
The contents fill me with delight. They consist of a Cetonia, alive and
kicking, all brilliant with metallic gleams and streaked with a few
white stripes, like those of the species who have developed freely in
the great heap of earth-mould. The shape and costume are not altered in
any respect. As for size, that is another matter. I have before my eyes
a pigmy, a little gem more exquisite than any collector ever found on
the blossoming hawthorns. From the edge of the clypeus to the tips of
the wing-cases this creature of my artificial devices measures thirteen
millimetres, [77] no more. The insect would have measured twenty
millimetres [78] if the grub had been properly fed, far away from my
famine-stricken tins. From these figures we deduce that the dwarf’s
bulk is about one-fourth of what it would have become normally, without
my interference.
Of the twenty-four larvæ subjected, during three or four months, some
to an absolute fast and others to a diet of meagre mouthfuls
administered at long intervals, one only reached the adult form. The
bad effects of abstinence are far-reaching and the pigmy still feels
them. Though the season when the caskets should have split had long
gone by, he had made no attempt to free himself. Perhaps he had not the
necessary strength. I myself had to break open the cell.
Public-domain text, read in full here on John Shaqi.
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