The flowers have become singers by long practice, or
else, those that were most musical having had the best chance to
reproduce, we have a neat illustration of the 'survival of the
fittest.' The sound is doubtless produced by a shrinking of the
fibres as the sun withdraws its heat, in which case we may expect
another song at sunrise, when the same result will be effected by
their expanding."
Searching for a camping-place in which to pass the coming hours,
they saw lights flitting about like will-o'-the-wisps, but
brighter and intermittent.
"They seem to be as bright as sixteen-candle-power lamps, but the
light is yellower, and appears to emanate from a comparatively
large surface, certainly nine or ten inches square," said the
doctor.
They soon gave up the chase, however, for the lights were
continually moving and frequently went out. While groping in the
growing darkness, they came upon a brown object about the size of
a small dog and close to the ground. It flew off with a humming
insect sound, and as it did so it showed the brilliant
phosphorescent glow they had observed.
"That is a good-sized fire-fly," said Bearwarden. "Evidently the
insects here are on the same scale as everything else.
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