In which the Coast of North-west America Has Been Casrefully Examined and Accurately Surveyed ; Undertaken by His Majesty's Command, Principally with a View to Ascertain the Existence of Any Navigable Communication Between the North Pacific and North Atlantic Oceans ; and Performed in the Years 1790, 1791, 1792, 1793,l 1794 and 1795, in the Discovery Sloop of War, and Armed Tender Chatham, Under the Command of Captain George Vancouver