Thoreau writes in his journal:
P.M.—To beeches.
As I sat by the Riordan crossing, thought it was the tanager I heard? I think now, only because it is so early, that it may have been the yellow-throat vireo . . .
Cleared out the Beech Spring, which is a copious one. So I have done some service, though it was a wet and muddy job. Cleared out a spring while you have been to the wars. Now that warmer clays make the traveller thirsty, this becomes an important work . . .