fairy ring

Though many a year has passed away, / None have seen Rhys since that day! / Does he dance and does he sing / For ever in a Fairy Ring?

This curious phenomenon has been differently accounted for. The following is Mr. Nicholson's description and explanation: "the appearance in the grass, says he, commonly called Fairy Rings, is well known. It consists either of a ring of grass of more luxuriant vegetation than the rest, or a kind of circular path in which the vegetation is more defective than elsewhere. It appears to be pretty well ascertained that the latter state precedes the former. […]