| Medium | |||
| LAKES | depth. | Superficial Area. | Solid Contents. |
| Feet. | Feet. | Feet. | |
| Superior, | 900 | 836,352,000,000 | 752,716,800,000,000 |
| Huron, | 900 | 527,568,000,000 | 501,811,200,000,000 |
| Michigan, | 900 | 376,898,400,000 | 59,208,560,000,000 |
| Erie, | 120 | 418,176,000,000 | 50,181,120,000,000 |
| Ontario, | 492 | 200,724,480,000 | 98,756,444,160,000 |
| St. Lawrence, and } | |||
| other rivers and} | " | 41,176,000,000 | 83,520,000,000 |
| smaller lakes,} | |||
| 2,430,894,880,000 | 1,742,757,644,160,000 |
Lake Superior, in its greatest length, is 381 miles; its breadth is 161; and its circumference is little less than 1152 miles—it is as remarkable for the transparency of its waters as for its extraordinary depth.
Lake Huron, from west to east, is 218 statute miles long; at its western extremity it is less than one hundred miles broad; and, at about one hundred miles from its eastern shore, it is barely 60 miles broad; but near the centre it suddenly bends away to the southward, and is a hundred miles in breadth; making a circumference of little less than 812 miles.
Lake Michigan deepens into a bay of 262 miles in length, by sixty-five in breadth; and its entire circumference is 731 miles.
Slave Trade.—A letter from Sierra Leone, dated Dec. 14, states, that there was more slave-dealing carried on at that period in the neighbouring rivers, than when it was allowed by the British government.
From the Boston Gazette.