that the river Plate, which has the broadest estuary of the South American rivers, is ninety-two geographical miles wide at its mouth; also he found the Orinoco to be more than three miles wide at five hundred and sixty miles from its mouth; but he does not tell us that ships of six hundred tons can sail up it so far, as they can up the St. Lawrence to Montreal,—an equal distance. If he had described a fleet of such ships at anchor in a city's port so far inland, we should have got a very different idea of the Orinoco. Perhaps Charlevoix describes the St. Lawrence truly as the most navigable river in the world. Between Montreal and Quebec it averages about two miles wide. The tide is felt as far up as Three Rivers, four hundred and thirty-two miles, which is as far as from Boston to Washington. As far up as Cap aux Oyes, sixty or seventy miles below Quebec, Kalm found a great part of the plants near the shore to be marine, as glass-wort (Salicornia), seaside pease (Pisum maritimum), sea-milk wort (Glaux), beach-grass (Psamma arenarium), seaside plantain (Plantago maritima), the sea-rocket (Bunias cakile), &c.
The geographer Guyot observes that the Maranon is three thousand miles long, and gathers its waters from a surface of a million and a half square miles; that the Mississippi is also three thousand miles long, but its basin covers only from eight to nine hundred thousand square miles; that the St. Lawrence is eighteen hundred miles long, and its basin covers more than a million square miles (Darby says five hundred thousand); and speaking of the lakes, he adds, "These vast fresh-water seas, together with the St. Lawrence, cover a surface of nearly one hundred thousand square miles, and it has been calculated that they contain about one half of all
