It Is Well Known That
Within The Tropics, The Hybernation, Or More Properly Aestivation,
Of Animals Is Determined Not By The Temperature, But
By The Times Of Drought.
Near Rio de Janeiro, I was at first
surprised to observe, that, a few days after some little
depressions had been filled with water, they were peopled by
numerous full-grown shells and beetles, which must have
been lying dormant.
Humboldt has related the strange accident
of a hovel having been erected over a spot where a
young crocodile lay buried in the hardened mud. He adds,
"The Indians often find enormous boas, which they call Uji
or water serpents, in the same lethargic state. To reanimate
them, they must be irritated or wetted with water."
I will only mention one other animal, a zoophyte (I believe
Virgularia Patagonica), a kind of sea-pen. It consists
of a thin, straight, fleshy stem, with alternate rows of polypi
on each side, and surrounding an elastic stony axis, varying
in length from eight inches to two feet. The stem at one
extremity is truncate, but at the other is terminated by a
vermiform fleshy appendage. The stony axis which gives
strength to the stem may be traced at this extremity into a
mere vessel filled with granular matter. At low water hundreds
of these zoophytes might be seen, projecting like stubble,
with the truncate end upwards, a few inches above the
surface of the muddy sand. When touched or pulled they
suddenly drew themselves in with force, so as nearly or quite
to disappear.
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