YOU must rise early in the morning, said Dame Louhi, the Wise Woman of the North. She stood at the door of her chamber and looked back into the low-raftered hall where her daughter was spinning. Her face was wrinkled and grim, her thin lips were puckered over her toothless mouth, her gray-green eyes sparkled beneath her shaggy eyebrows.  She paused and listened. No answer came from her busy daughter. The day was almost ended. Already the swallows were asleep under the eaves, the reindeer were lying down in their paddock, all the underlings of Dame Louhis household had retired to rest. So near was her dwelling to the sea that she could hear the waves lapping on the beach and the ice-floes crunching and grinding and pounding against the shore. But other sounds there were none.