Thoreau writes in his journal:
Trees generally leafing. black willow leafs. Bass leaf is an inch over; probably began about the 14th. Panicled andromeda leafed in some places, probably a day or two. Grape buds begin to open. Swamp white oak leaf, probably yesterday. Silky cornel leaf, two days or three. A woodcock, near river. A blue heron-like bird on a tree over river . . .