52 David Milne-Home on Ancient Glaciers. 
the rocks, it must have been transporting blocks on its sur- 
face, and ata great height above its bed, and depositing these, 
in its downward course, at convenient spots. 
I was unfortunately prevented from continuing my researches 
down the valley; but I learnt from my guide, that the moun- 
tains enclosing it, on each side, are at great heights strewed 
with blocks, almost all along course of Arve to Geneva. I see 
that Professor Neckar, in his “ Etudes Geologiques dans les 
Alpes,” speaks of several groups of granite blocks at Servoz, 
St Gervais, Sallenches, Mayland, Clases, and other places, 
along this valley; the group at St Gervais being stated by 
him to be at a height of 4812 feet above the sea. 
Had however an opportunity, when at Geneva, of examin- 
ing an immense accumulation of blocks, at lower extremity 
of the same valley, on Petit Saléve mountain. This moun- 
tain which reaches to a height of 2800 feet above the sea, is 
situated on west side of the Arve; it slopes towards the E., 
S.E., and S., whilst to the N. and W. it is precipitous. Its 
E. and S.E. slopes, consisting of limestone strata, are covered 
with alpine blocks to the very top; even on edges of the 
crags facing Geneva, there are blocks perched, in apparently 
a very precarious position. On west side is the valley of 
Monetier, which separates the Petit from Grand Saléve. It 
is rather important to remark, that in this valley there are 
no blocks except at its south and north extremities; and that. 
the only parts of the mountain covered with blocks are those 
parts facing the valley which descends from Chamouni. On 
south slope of the Grand Saléve, situated about a mile to the 
west, there are very few blocks; but then there is a hill on 
the south, which to a great extent prevents any glacier de- 
scending by the Arve valley, abutting on the Grand Saléve. _ 
I had no doubt that the blocks on the Petit Saléve must 
have been lodged there by a glacier which descended from 
Chamouni by Les Ouches, St Gervais, and Sallenches, a dis- 
tance of from thirty to forty miles. 
8. Before leaving Chamouni valley, let me advert to some 
remarkable traces of ancient glaciers in higher parts, at en- 
trance to Val Orsine. 
(1.) Just above village of Argentier, there is an oblong heap 
