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THOMPSON'S COAST PILOT FOR THE UPPER LAKES. MAGNITUDE OF THE LAKES OR "INLAND SEAS." Nornine but a voyage over all of the great bodies of water forming the "Inland Seas," can furnish the tourist, or scientific ex- plorer. a just idea of the extent, depth, and clearness of the waters of the Great Lakes of America, together with the healthy influence, fertility, and romantic beauty of the numerous islands, and sur- rounding shores, forming a circuit of about 4,000 miles, with an area of 90,000 square miles, or about twice the extent of the State of New York--extending through eight degrees of latitude, -and sixteen degrees of longitude--this region, embracing the entire north half of the temperate zone, where the purity of the atmos- phere vies with the purity of these extensive waters, or "Inland Seas," being connected by navigable rivers or straits. The States washed by the Great Lakes, are New York, Penn- 'sylvania, Ohio, Michigan, Indiana, Illinois, Wisconsin, Minnesota, and' Canada West--the boundary line between the United States -- and the British Possessions running through the centre of Lakes Superior, Huron, St. Clair, Erie, and Ontario, together with the 'connecting rivers or straits, and down the St. Lawrence River to the 45th parallel of latitude. From thence the St. Lawrence 'flows in a northeast direction through Canada into the Gulf of St. Law- 'rence. The romantic beauty of the rapids of this noble stream, -and its majestic flow through a healthy and rich section of country, 'is unsurpassed for grand lake and river scenery. : - Laxe Svrerror, the largest of the Inland Seas, lying between -46° 30' and 49° north latitude, and between 83° 30' and 92° 30'