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This Island has its name, from its sometimes being visible
for a few days, and then becoming invisible for many weeks,
or even months; at which time it is covered by water to the
depth of two fathoms. It is worthy of remark, that the
island is never visible unless the water in the lake be
high, and then it scarcely appears more than a foot above
the surface. This island is about twenty yards in diameter,
nearly circular, and slopes gradually from the center to the
circumference; and from thence, as far as the eye can
distinguish the sloping is more sudden.
The phaenomena of this island are extremely paradoxical, but
may I think admit of a very enforced solution. It never
appears but when the Lake is swelled with rain, and at that
time a very considerable torrent from the adjacent heights
comes pouring down Cat-Gill, where it sinks among the loose
stones: the bottom of the Lake in this part is all covered
by a very fine, close grass, with remarkable strong matted
roots, seemingly the same kind with the calomnus
aromaticus, and the island lyes but at a small distance
from the shore. All these circumstances I had an opportunity
of observing, not only when I took the soundings, but at
many other times;
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