in Thoreau’s Journal:
The maples about Walden are quite handsome now. Standing on the railroad, I look across the pond to Pine Hill, where the outside trees and the shrubs scattered generally through the wood glow through the green, yellow, and scarlet, like fires just kindled at the base of the trees, – a general conflagration just fairly under way, soon to envelop every tree. The hillside forest is all aglow along its edge and in all its cracks and fissures, and soon the flames will leap upward to the tops of the tallest trees. About the pond I see maples of all their tints, and black birches (on the southwest side) clear pale yellow; and on the peak young chestnut clumps and walnuts are considerably yellowed.