This paper describes the remarkable changes which the glacier of La Brenva, on the south side of Mont Blanc, has undergone between the years 1842 and 1846.

It has increased to such an extent, that it has risen against the opposing wall of rock on the side of the valley nearly 200 feet vertically; it has covered a large additional surface of ground, and appears to be approaching the moraines of 1818. The author describes the measures which he took for comparing its size at any future period, and he cites some observations made by the Vicar of Courmayeur (M. Guicharda), which plainly establish its continued motion during winter.