We have had a very interesting expedition to the Mammoth Cave of Kentucky. But, first, a word of Louisville itself.

It is a fine city, and the best lighted, I think, that I have seen in the United States. I imagine the Louisvillians are proud of this, as they have their diligences start at four o'clock in the winter's morning! It is the chief commercial city of Kentucky, and lies on the south bank of the Ohio. The canal from Portland enables large steamers to come to the wharves. An extensive trade is carried on here, and there are manufactories of various descriptions, the facilities offered by the enormous water-power of the region assisting greatly in the development of this department of industry. There are numerous factories, foundries, woollen and cotton mills, flour mills, &c. The population is about forty-seven thousand : in 1800, it was only six hundred. Kentucky is a very prosperous state.

The natural growths of the soil are–the black cherry, black walnut, chestnut, honey-locust, buck-eye, pawpaw, mulberry, sugar-maple, ash, elm, white-thorn, cotton-wood, an abundance of grape-vines, and various others. Part of the country we traversed in going to “The Cave,” is called the “barrens;” other portions looked very fertile, and reminded me exceedingly of England.