It has now been satisfactorily ascertained by Lieut. Maury that the basin of the Atlantic ocean is a long trongh, separating the Old World from the New, and extending probably from pole to pole. From the top of Chimbo-razo to the bottom of the ocean, at the deepest place reached by the plummet in the northern Atlantic, the distance in a vertical line is nine miles. The deepest part of the north Atlantic is probably somewhere between the Bermudas and the Grand Banks. The waters of the GnU of Mexico are held in a basin about a mile deep in the deepest part. There is at the bottom of the sea between Cape Race and Newfoundland and Cape Clear in Irelanu, a remarkable steppe, which is already known as the " telegraphic plateau." The great circle distance between these two shore lines is sixteen hundred miles, and the sea along this route is probably nowhere more than ten thousand feet deep.