In the state of Kentucky there are several subterraneous _caverns_, which have attracted much attention, and which are described as among the most extraordinary natural curiosities in the world. They are also of considerable importance in a commercial view, from the quantity of nitre they afford. The great cave, near Crooked Creek, is supposed to contain a million pounds of nitre. This cave has two mouths or entrances, about six hundred and fifty yards from each other, and one hundred and fifty yards from the creek.] Tenth Day's Instruction. UNITED STATES CONTINUED. _Narrative of the Journey of M. Michaux, from Lexington to Charleston in South Carolina._ On the tenth of August, M. Michaux set out from Lexington to Nasheville, in the state of Tenessee; and, as an establishment for the purpose of naturalizing the vine in Kentucky, was not very far out of his road, he resolved to visit it. Consequently, about fourteen miles from Lexington, he quitted the road, turned to the left, strolled through some woods, and reached the vineyard in the evening. It was, at this time, under the superintendance of a M. Dufoux, the principal person of a small Swiss colony, which had settled in Kentucky some years before. The vines had been selected chiefly from the vicinity of New York and Philadelphia. Many of them had failed; but those of the kinds which produce the Madeira wines, appeared to give considerable hopes of success. The whole of the vines occupied a space of about six acres; and they were planted and fixed with props similar to those in the environs of Paris. From this place M. Michaux was conducted, through the woods, to a ferry over the _Kentucky River_. The borders of the river at this ferry are formed by an enormous mass of chalky stones, remarkably peaked, and about a hundred and fifty feet high. Near _Harrodsburgh_ M. Michaux visited the plantation and residence of General Adair. A spacious and commodious house, a great number of black servants, equipages: every thing announced the opulence of the general. Magnificent peach-orchards, and immense fields of Indian wheat, surrounded the house. The soil was extremely fertile, as was evident from the largeness of the blades of corn, their extraordinary height, and the abundance of the crops. About forty miles beyond the general's plantation, M. Michaux passed over _Mulder Hill_, a steep and lofty mountain, that forms a kind of amphitheatre. From its summit the neighbouring country presents the aspect of an immense valley, covered with forests of imperceptible extent. As far as the eye can reach, nothing but a gloomy verdant space is seen, formed by the tops of the close-connected trees, and, through which, not even the vestige of a plantation can be discerned. The profound silence that reigns in these woods, uninhabited by savage beasts, and the security of the place, forms an _ensemble_ rarely to be seen in other countries.