It has now become necessary to advance the time three entire days, and to change the scene to Key West. As this latter place may not be known to the world at large, it may be well to explain that it is a small seaport, situate on one of the largest of the many low islands that dot the Florida Reef, that has risen into notice, or indeed into existence as a town, since the acquisition of the Floridas by the American Republic. For many years it was the resort of few besides wreckers, and those who live by the business dependent on the rescuing and repairing of stranded vessels, not forgetting the salvages. When it is remembered that the greater portion of the vessels that enter the Gulf of Mexico stand close along this reef, before the trades, for a distance varying from one to two hundred miles, and that nearly every thing which quits it, is obliged to beat down its rocky coast in the Gulf Stream for the same distance, one is not to be surprised that the wrecks, which so constantly occur, can supply the wants of a considerable population. To live at Key West is the next thing to being at sea. The place has sea air, no other water than such as is preserved in cisterns, and no soil, or so little as to render even a head of lettuce a rarity. Turtle is abundant, and the business of "turtling" forms an occupation additional to that of wrecking. As might be expected in such circumstances, a potato is a far more precious thing than a turtle's egg, and a sack of the tubers would probably be deemed a sufficient remuneration for enough of the materials of callipash and callipee to feed all the aldermen extant. Of late years, the government of the United States has turned its attention to the capabilities of the Florida Reef, as an advanced naval station; a sort of Downs, or St. Helen's Roads, for the West Indian seas. As yet little has been done beyond making the preliminary surveys, but the day is not probably very distant when fleets will lie at anchor among the islets described in our earlier chapters, or garnish the fine waters of Key West. For a long time it was thought that even frigates would have a difficulty in entering and quitting the port of the latter, but it is said that recent explorations have discovered channels capable of admitting any thing that floats. Still Key West is a town yet in its chrysalis state, possessing the promise rather than the fruition of the prosperous days which are in reserve. It may be well to add, that it lies a very little north of the 24th degree of latitude, and in a longitude quite five degrees west from Washington. Until the recent conquests in Mexico it was the most southern possession of the American government, on the eastern side of the continent; Cape St. Lucas, at the extremity of Lower California, however, being two degrees farther south.