Kneeling in a "bullboat," fashioned from the skin of an animal, and wielding a paddle with the dexterity only to be attained after years of practice in canoeing, a sturdily-built and thoroughly bronzed Canadian lad glanced ever and anon back along the course over which he had so recently passed; and then up at the black storm clouds hurrying out of the mysterious North. It was far away in the wilderness of the Northwest, where this fierce tributary...