In this neighbourhood are seen many singular and unaccountable cavities. These are funnel-shaped; and some of them are from twenty to forty yards across at the rim. Their perpendicular depth is, in many instances, upwards of twenty feet. At this time, nearly the whole of East Florida, and a great portion of West Florida, were in the possession of Indians; and these chiefly a tribe called _Siminoles_, an apparently contented and happy race of people, who enjoyed, in superabundance, the necessaries and the conveniences of life. With the skins of deer, bears, tigers, and wolves, together with honey, wax, and other productions of their country, this people purchased, from Europeans, clothing, equipage, and domestic utensils. They seemed to be free from want or desires: they had no enemy to dread; and, apparently, nothing to occasion disquietude, except the gradual encroachments of the white people. Mr. Bartram returned to the trading-store, on the bank of the river St. John; and, about the end of September, he reached the place from which he had commenced his voyage. * * * * * We must now proceed, across the southern states, to the mouth of the Mississippi, for the purpose of tracing the course of that astonishing river, and describing the most important places in its vicinity. Fourteen Day's Instruction. UNITED STATES CONTINUED. _The River Mississippi._ The Mississippi has its source in about forty-six degrees thirty minutes of north latitude; and terminates in the Gulf of Mexico, at some distance below the town of New Orleans. Its length, in a direct line, exceeds one thousand seven hundred miles; and it falls into the sea, by many mouths, most of which, like those of the Nile, are too shallow to be navigable. For a considerable distance, its banks are low, marshy, and covered with reeds; and are annually overflowed, from the melting of the snows in the interior of the country. The inundation usually commences in March, and continues about three months; and the slime which it deposits on the adjacent lands, tends, in a very important degree, to fertilize the soil. This river is navigable to a great distance; but, at spring-tides, the navigation is difficult, on account of the strength of the currents, and the innumerable islands, shoals, and sand-banks, with which it is interspersed. Vessels of three hundred tons burden can ascend it as high as Natchez, four hundred miles from the sea; and those of lighter burden can pass upward, as far as the Falls of St. Anthony, in latitude forty-four degrees fifty minutes.