Note 34 — Chapter IV · THEORY OF DENUDATION—CONCLUDED.
Reading edition
Agassiz, Etudes sur les Glaciers; Tyndall, Glaciers of the Alps; also Heat as a mode of Motion, by the same Author; Lyell, Principles of Geology, vol. i., chapter xvi.; Elements of Geology, chapters xi., xii.; Wallace, Ice Marks in North Wales, in the Quarterly Journal of Science, No. xiii.