THE FORMER EXTENSION OF GLACIERS. I4I 
near Geneva, so called from a tradition that in 
Roman times sacrifices were offered upon them to 
Neptune. The “Pierre de Crans” near Nyon, is 73 
feet long and 20 high. 
The “Pierre a Bot,” near Neuchatel, at a height 
of 2200 feet, is 62 feet in length, 48 in breadth, and 
40 feet high. It is of Protogine, and probably came 
from the Mont Blanc. 
Other celebrated erratic blocks are the “Plough- 
stone,” which rises 60 feet above the ground be- 
tween Erlenbach and Wetzweil, and contains over 
72,000 cubic feet of stone; the Bloc du Tresor near 
Orsi^res with a cubic content of 100,000 feet; the 
Monster block at Montet, near Devent, 160,000; and 
the largest of all is, I believe, a mass of Serpentine 
on the Monte Moro, near the Mattmark See, which 
measures 240,000 cubic feet. These enormous 
blocks are of course exceptional, but smaller ones 
are innumerable. In some localities are immense 
groups — for instance on the hill of Montet, near 
Devent, at Orsiires in the valley of the Dranse 
D’Entremont above Martigny, at Arpille on the north 
side of the valley of the Rhone opposite Martigny, 
and, still further away from the mountains, the entire 
south slope of the Jura is strewn with Granite blocks. 
“Between Moliers, Travers, and Fleurier,” says De 
