... only for a brief period that the blossoms of our sugar maple are sweet-scented; the perfume seems to become stale after a few days: but pass under this tree just at the right moment, say at nightfall on the first or second day of its perfect inflorescence, and the air is loaded with its sweetness; its perfumed breath falls upon you as its cool shadow does a ... — A Year in the Fields • John Burroughs