The raised portion still stands up above the unraised, like a
long perpendicular rampart, known by the name of Ullah Bund, or God's
Wall.
* * * * *
With a similar fertility of illustration, Herschel sets before us the
phenomena of volcanic eruptions and their extraordinary effects.
In a district of Mexico, between the two streams of the Cintimba and the
San Pedro, on the 28th of September 1789, a whole tract of ground, from
three to four miles in extent, surged up like a foam-bubble, or the
swell of a wave, to a height of upwards of 500 feet. Flames, lurid and
crackling, broke forth over a surface of more than half a square league;
and the earth, as if softened by heat, was seen to rise and sink like
the rolling tide. Vast chasms opened in the earth, into which the two
rivers poured their waters headlong; reappearing afterwards at no great
distance from a cluster of _hornitos_, or small volcanic cones, which
sprang out of the mighty mud-torrent that gradually covered the entire
plain.
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