valanche

But the great danger of travelling here when the sun is up, proceeds from what they call the Valanches. These are balls of snow detached from the mountains which over-top the road, either by the heat of the sun, or the humidity of the weather. A piece of snow thus loosened from the rock, though perhaps not above three or four feet in diameter, increases sometimes in its descent to such a degree, as to become two hundred paces in length, and rolls down with such rapidity, that the traveller is crushed to death before he can make three steps on the road.