Now, it being Christmas when the ship shot from out her harbor, for a space we had biting Polar weather, though all the time running away from it to the southward; and by every degree and minute of latitude which we sailed, gradually leaving that merciless winter, and all its intolerable weather behind us. It was one of those less lowering, but still grey and gloomy enough mornings of the transition, when with a fair wind the ship was rushing through the water with a vindictive sort of leaping and melancholy rapidity, that as I mounted to the deck at the call of the forenoon watch, so soon as I leveled my glance towards the taffrail, foreboding shivers ran over me. Which detail sets the scene