More often in books we move, as I have said, from place to place as in a dream. But it is a dream in the _Mabinogion_ which gives one of the most majestic scenes of travel. I mean the dream of the Emperor Maxen. He dreamed that he was journeying along a river valley towards its source, and up over the highest mountain in the world until he saw mighty rivers descending to the sea, and one of them he followed to a great city at its mouth and a vast castle in the city. At the end of his journey the dreaming Emperor found a girl so beautiful that when he awoke he could think of naught else, while years went by, except her beauty. He sent out pioneers to discover the road of his dream, and at last they brought him to the castle and the same girl Helen sitting in the hall of it. She became his bride, and he gave her three castles--one at Arvon in North Wales, one at Caerleon, and one at Caermarthen in the South. Then, says the tale, “Helen bethought her to make high-roads from one castle to another throughout the Island of Britain. And the roads were made. And for this cause are they called the roads of Helen Luyddawc, that she was sprung from a native of this island, and the men of the Island of Britain would not have made these great roads for any save her.” It is natural to connect with this Helen the great ancient roads leading north and south across Wales known as Sarn Helen or Elen. Nothing could be more noble as the name of a mountain road than Sarn Helen or Helen’s Causeway. It suggests to the ordinary fanciful and unhistoric mind the British Helena, mother of the Emperor Constantine, and that it suggested this long ago is clear from the old identification of Helen Luyddawc with the only child of King Cole of Colchester. The name has more recently been explained as Sarn y Lleng, the Road of the Legions. Sir John Rhys[1] insists upon Elen instead of Helen, and believes her to be one of the pagan goddesses of the dusk. “There is,” he says, “a certain poetic propriety in associating the primitive paths and roads of the country with this vagrant goddess of dawn and dusk.” These wandering paths are to the hard white highways what dusk is to the full blaze of day. First perhaps trodden by the wild herd and still without terrors for it, they might well be protected by a sort of Artemis, goddess of wildernesses and of forked ways, kind both to human hunters and the wild quarry. They belong to the twilight of the world. No doubt the sun shines no brighter at noon than it did then on a perfectly wild earth, on flowers that were never gathered, on bright plumage that no man had coveted. But all the forest and marsh of primeval earth form in the imagination mists to which the lack of history adds yet another veil. These mists lie over the world, to my mind, exactly as the white mist of summer lies, turning into a sea most of what once was land and making islands of the woods on the steep, uncultivated tracts. The islands rising