]
[Footnote 153: Original edition of 1830, i. 369.]
[Footnote 154: See Professor Tyndall's _Glaciers of the Alps_, for an
account of glacier-tables, sand-cones, &c. Anyone who has walked on a
glacier will have noticed the little pits which any small black
substance, whether a stone or a dead insect, sinks for itself in the
ice.]
[Footnote 155: Gilbert, _Annalen_, lxix. 143.]
[Footnote 156: According to the latest accounts I have been able to
obtain, a temperature of 29.75 deg. F. had already been reached some years
ago; the temperature, a few feet from the surface, being 14 deg. below
freezing. The soil here only thaws to a depth of 3 feet in the hottest
summer. Sir R. Murchison wrote to Russia, in February last, for further
information regarding this well.
Since I wrote this, Sir Roderick Murchison has applied to the Secretary
of the Imperial Academy of St. Petersburg for further information
respecting the investigations at Jakutsk. The Secretary gives a
reference to Middendorff's _Sibirische Reise_, Bd. iv. Th. i., 3te
Lieferung, _Klima_, 1861.
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