Note 23 — XXIV. THE MATTERHORN—THIRD AND LAST ASSAULT.

I should estimate the level of the Lower Grindelwald glacier, at the point where it is usually entered upon to reach the Eismeer, to be nearly one hundred feet vertically lower in 1867 than it was in 1856. I am glad to find that the question of ‘Benchmarks’ to fix such changes of level is now before the Council of the British Association.