in Thoreau’s Journal:
Sat in the old pasture beyond the Corner Spring Woods to look at that pine wood now at the height of its change, pitch and white. Their change produces a very singular and pleasing effect. They are regularly parti-colored. The last year’s leaves, about a foot beneath the extremities of the twigs on all sides, now changed and ready to fall, have their period of brightness as well as broader leaves. They are a clear yellow, contrasting with the fresh and liquid green of the terminal plumes, or this year’s leaves. These two quite distinct colors are thus regularly and equally distributed over the whole tree. You have the warmth of the yellow and the coolness of the green. So it should be with our own maturity, not yellow to the very extremity of our shoots, but youthful and untried green ever putting forth afresh at the extremities, foretelling a maturity as yet unknown. The ripe leaves fall to the ground and become nutriment for the green ones, which still aspire to heaven.