Thoreau writes in his journal:
P.M.—To Beeches.
Young red maples are generally later to leaf than young sugar maples; hardly began before yesterday; and large white are not so forward as young sugar. Muhlenberg’s willow leafed for or five days. Young yellow birch leaf, say two days. In Callitriche Pool hear a bullfrog belch or dump. Is that a proserpinaea with finely divided leaves in this pool? Hear a tree-toad,—or maybe a woodpecker tapping . . .