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Northern Rivers,
Snow
Carlisle, Apr. 16.
Mr URBAN,
THESE rivers, the Kirtle, Esk, Liddale, Tiviot and
Line, have their rise, and a great part of
their course among bleak and desolate mountains.
By the hot and dry weather in the last autumn, they were
lower than ever known, and the earth was heated to an
uncommon degree.
For this reason, although the snows in Feb. were
heaped upon the mountains, by strong winds intensely cold,
yet there was a ground thaw in the plains.
This constant drift of snow on the mountains, and intense
cold of the air, consolidated the flakes in their descent,
and a long succession of these congealed every standing
pool, or mill dam in the channel to the bottom. - So that
the intermediate channel became dry.
But soon after the ice had reach'd the bottom of these
pools, the ground thaw began insensibly to waste it away,
and thus the waters of the river gradually rose; tho' in
Esk, which has but few pools no sensible increase of
waters might ensue, as was the case.
But in Line, which, tho' less than Esk, has
more pools, a deep channel, and slow course, it was
otherwise; for although, by the cause above assigned, the
few fords that it has were passed by persons on foot, dry
shod; yet within a few hours, there was so great a swell,
that they were dangerous to horsemen.
The different courses of the freezing air, and the situation
of the mountains, with respect to the several rivers, were
the cause why this circumstance did not happen all on the
same day. And that several adjoyning rivers did not freeze
must be attributed to their running through a more level,
and, therefore, a warmer country; and for the same reason
some parts of the Esk might have little ice, as it is
not all surrounded by mountains.
Yours &c. A.B.
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