"Now look at my map. This inner circle represents the present area of
boiling lava, which, as I have said, is about fifteen miles in
diameter--the South Pole, according to the natives, being at about the
point corresponding to this dot, marked 'a.' The ring next without the
circle I have made to represent a zone of lava which is at its inner
edge white-hot, and at its outer edge red-hot, its width, let us say, as
the division is arbitrary, about four miles. The second circle
represents a zone of lava which is dull red at its inner edge, and
black, but hot, at its outer. Of course the lava blends away from
white-hot within, to barely warm without; but I thus map it, the better
to picture reigning conditions. The next circle, some four or five miles
in width, represents a ring of cold lava-blocks, masses of rock-salt,
and animalculine remains, from twenty-five to two hundred feet high.
Outside of this last-mentioned zone, we have several rings of volcanic
mountains with intervening valleys, and many active craters at the
summit of mountains; while on the mountain-sides lie numerous masses of
rock-salt, thrown from below by eruptive action, glistening in the
brilliant volcanic light, and slowly deliquescing.
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