Thoreau writes in his journal:
I thought, by the peculiar moaning sound of the wind about the dining-room at noon, that we should have a rain-storm . . .
Against Bittern Cliff I feel the first drop strike the right slope of my nose and run down the ravine there. Such is the origin of rivers. Not till half a mile further my doubting companion feels another on his nose also, and I get one [in] my eye, and soon after I see the countless dimples in the puddles on the ice. So measured and deliberate is Nature always . . .