GENERAL MAP OF ROUTES FOLLOWED BY THE AUTHOR DURING TWO VOYAGES MADE TO THE GULF OF MEXICOISLAND OF ST. PAUL. — THE PORTALS OF THE GULF OF ST. LAWRENCE. — THE EXTINCT AUK. — ANTICOSTI ISLAND. — ICEBERGS. — SAILORS' SUPERSTITIONS. — THE ESTUARY OF THE ST. LAWRENCE. — TADOUSAC. — THE SAGUENAY RIVER. — WHITE WHALES. — QUEBEC.CHAPTER I. THE APPROACHES TO THE WATER-WAY OF THE CONTINENT.