Note 39 — Chapter IV

I know no effect more strikingly characteristic of the departure of a storm than the smoking of the mountain torrents. The exhausted air is so thirsty of moisture, that every jet of spray is seized upon by it, and converted into vapor as it springs; and this vapor rises so densely from the surface of the stream as to give it the exact appearance of boiling water. I have seen the whole course of the Arve at Chamonix one line of dense cloud, dissipating as soon as it had risen ten or twelve feet from the surface, but entirely concealing the water from an observer placed above it.