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Northern California, Oregon, and the Sandwich Islands by Charles Nordhoff
page 48 of 346 (13%)
sometimes entirely melt down. Standing upon the northern bank we could see
both lakes, and we estimated their shortest diameter to be about 500 feet,
and the longest about one-eighth of a mile. Within this pit the surface of
the molten lava was about eighty feet below us. It has been known to sink
down 400 feet; last December it was overflowing the high banks and sending
streams of lava into the great plain by which we approached it; and since
I saw it, it has risen to within a few feet of the top of the bank,
and has forced a way out at one side, where, in September, 1873, it was
flowing out slowly on to the great lava plain which forms the bottom of
the main crater.

What, therefore, Madame Pele will show you hereafter is uncertain. What we
saw was this: two large lakes or caldrons, each nearly circular, with
the lower shelf or bank, red-hot, from which the molten lava was repelled
toward the centre without cessation. The surface of these lakes was of a
lustrous and beautiful gray, and this, which was a cooling and tolerably
solid scum, was broken by jagged circles of fire, which appeared of a
vivid rose-color in contrast with the gray. These circles, starting at
the red-hot bank or shore, moved more or less rapidly toward the centre,
where, at intervals of perhaps a minute, the whole mass of lava suddenly
but slowly bulged up, burst the thin crust, and flung aloft a huge, fiery
wave, which sometimes shot as high as thirty feet in the air. Then ensued
a turmoil, accompanied with hissing, and occasionally with a dull roar as
the gases sought to escape, and spray was flung in every direction; and
presently the agitation subsided, to begin again in the same place, or
perhaps in another.

Meantime the fiery rings moved forward perpetually toward the centre, a
new one re-appearing at the shore before the old was ingulfed; and not
unfrequently the mass of lava was so fiercely driven by some force from
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