263, with respect to the
loose stones near Les Plans. Forchhammer found, on the Faroe Islands,
that springs which rise from loose stones are invariably colder than
those which proceed from more solid rock at the same elevation, as
indeed might have been expected.]
[Footnote 141: xvii. 337. The account is taken from a Dutch journal.]
[Footnote 142: xix. p. 124.]
[Footnote 143: October 11, 1829.]
[Footnote 144: viii. 254.]
[Footnote 145: Pp. 174-6.]
[Footnote 146: Thermometer about 85 deg. F.]
[Footnote 147: v. 154.]
[Footnote 148: iv. 300.]
[Footnote 149: _Die erloeschenen Vulkane in der Eifel_, S. 59.]
[Footnote 150: Dr. Gmelin, of Tubingen, detected the presence of ammonia
both in clinkstone lava and in columnar basalt (_American Journal of
Science_, iv. 371).]
[Footnote 151: _Geology and Extinct Volcanoes of Central France_, p. 60
(second edition).]
[Footnote 152: Mr. William Longman has informed me that some years ago
he had ice given him in summer, when he was on a visit to the inspector
of mines at Pont Gibaud, and he was told that it was formed in a
neighbouring cavern during the hot season.
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