Note 70 — Chapter IX
Reading edition
The split fragments I was wholly unable to account for, till my attention was directed by Mr. Darwin to the observations of Charpentier and Agassiz, who refer similar ones met with in the Alps, to rocks which have fallen through crevasses in glaciers.—See “Darwin on Glaciers and Transported Boulders in North Wales.” London, “Phil. Mag.” xxi. p. 180.