eferred more fully to these and to Mr. Hall's Report on
the Geology of New York, as well as to the earlier writings of
Hennepin and Kalm in the same work, and have speculated on the
origin of the escarpment over which the Falls may have been
originally precipitated. Vol. i. p. 32, and vol. ii. p. 93.

[283] Consid. sur les Blocs Errat. 1829.

[284] Capt. Bayfield, Geol. Soc. Proceedings, vol. ii. p. 223.

[285] M. Arago, Annuaire, &c. 1833; and Rev. J. Farquharson,
Phil. Trans. 1835, p. 329.

[286] Journ. of Roy. Geograph. Soc. vol. vi. p. 416.

[287] See Systeme Glaciaire, by Agassiz, Guyot, and Desor, pp.
436, 437, 445. Mr. Agassiz, at p. 462, states that he published
in the Deutsche Vierteljahrschrift for 1841, this result as to
the central motion being greater than that of the sides, and
was, therefore, the first to correct his own previous mistake.

[288] J. Forbes. 8th Letter on Glaciers, Aug. 1844.

[289] See Mr. Hopkins on Motion of Glaciers, Cambridge Phil.
Trans. 1844, and Phil. Mag. 1845. Some of the late concessions
of this author as to a certain plasticity in the mass, appear
to me to make the difference between him and Professor Forbes
little more than one of degree. (For the latest summary of
Prof. Forbes' views, see Phil. Trans. 1846, pt. 2.)

[290] This experiment is cited by Mr. Forbes, Phil. Trans.
1846, p. 206; and I have conversed with Mr. Christie on the
subject.

[291] Etudes sur les Glaciers, 1840.

[292] See Manual of Geol. ch. xi.

[293] Agassiz, Jam. Ed. New Phil. Journ. No. 54, p. 388.

[294] Charpentier, Ann. des Mines, tom. viii.; see also Papers
by MM. Venetz and Agassiz.

[295] Voyage in 1822, p. 233.

[296] Travels in Norway.

[297] Darwin's Journal, p. 283.

[298] Journ. of Roy. Geograph. Soc. vol. ix. p. 526.

[299] Journ. of Roy. Geograph. Soc. vol. ix. p. 529.

[300] Ibid. vol. viii. p. 221.

[301] In my Travels in N. America, pp. 19, 23, &c., and Second
Visit to the U. S., vol. i. ch. 2, also in my Manual of
Geology, a more full account of the action of floating ice and
coast-ice, and its bearing on geology, will be found.

[302] Jam. Ed. New Phil. Journ. No. xlviii. p. 439.

[303] Bulletin de la Soc. Gaol. de France, 1847, tom. iv. pp.
1182, 1183.