The present paper, though it has a bearing upon the problems of comparative literature, does not deal directly with literary works themselves, but is confined to the study of a single rhetorical figure which made its appearance more than two thousand years ago and still lingers in folk rimes of the present day. This rhetorical figure, which is striking enough to be easily identifiable, can be traced all the way from the Orient to Western Europe and thus serves as a floating straw to mark the currents and eddies in the stream of literary tradition.