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*3) The Mammoth Cave of Kentucky.
*4) In Iceland, 1783.
*5) "During the eruption of Hecla, in 1766, clouds of this kind
produced such a degree of darkness that, at Glaumba, which is more than
fifty leagues from the mountain, people could only find their way by
groping. During the eruption of Vesuvius, in 1794, at Caserta, four
leagues distant, people could only walk by the light of torches. On the
first of May, 1812, a cloud of volcanic ashes and sand, coming from a
volcano in the island of St. Vincent, covered the whole of Barbadoes,
spreading over it so intense a darkness that, at mid-day, in the open
air, one could not perceive the trees or other objects near him, or
even a white handkerchief placed at the distance of six inches from the
eye."--Murray, p. 215, Phil. edit.
(
*6) In the year 1790, in the Caraccas during an earthquake a portion of
the granite soil sank and left a lake eight hundred yards in diameter,
and from eighty to a hundred feet deep. It was a part of the forest of
Aripao which sank, and the trees remained green for several months under
the water."--Murray, p. 221
(
*7) The hardest steel ever manufactured may, under the action of a
blowpipe, be reduced to an impalpable powder, which will float readily
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