in Thoreau’s Journal:

Pm Skating to Fair Haven Pond

Made a fire on the south side of the pond.  Using—canoe birch bark & oak leaves for kindlings…

We skated home in the dark—with an odor of smoke in our clothes. It was pleasant to dash over the ice—feeling the inequalities which we could not see—now rising over considerable hillocks for it had settled on the meadows—now descending into corresponding hollows.