Note 30 — Chapter XI · PASSAGE OF THE COL DE TRIOLET, AND ASCENTS OF MONT DOLENT, AIGUILLE DE TRÉLATÊTE AND AIGUILLE D’ARGENTIÈRE.
Reading edition
“The stones that are found upon the upper extremities of glaciers are of the same nature as the mountains which rise above; but, as the ice carries them down into the valleys, they arrive between rocks of a totally different nature from their own.”—De Saussure, § 536.