_Coal_, in the county of Muskingum, Ohio. Common stone-coal, highly bituminous, (the slaty or black coal of Werner,) is found abundantly. _South of Lake Erie_, about 25 miles, in the bed of Rocky River, are found shells, and other animal remains, imbedded in argillaceous iron; the specimens were collected in 1817, by the Rev. R. Searle. _Mammoth's Tooth_, from the River St. Francis, west of Mississippi. Return J. Meigs, Esq. has transmitted, through the Rev. E. Cornelius, a mammoth's tooth, apparently not mineralized. It appears to have belonged to a very old animal, as the processes, (which, it is well known, are commonly very prominent) are worn down smooth, and some of them almost obliterated. _Blue Ridge, Tennessee, and Mississippi Territory._--Through the kindness of the Rev. E. Cornelius, and of Mr. John H. Kain, we have received a considerable collection of specimens, illustrative of the mineralogy and geology, and Indian antiquities of these regions; they may be, on a future occasion, the subject of more particular remarks. _Coal_, in Suffield, Connecticut, on the river of the same name. From Mr. Nathan Stedman, we have received specimens of coal, found in thin veins, in rocks of slate, and argillaceous sandstone, on the banks of the river. The veins are thin, but considerably numerous; the coal is very glossy and black; breaks with a smooth and almost conchoidal fracture, and very much resembles jet. It is very much intersected by thin veins--(not thicker than a knife-blade)--of white crystallized calcareous spar. This coal is bituminous, and burns pretty freely. It has not been explored, except superficially. _Coal_, in Southington, Connecticut. Beds of slate are found more or less bituminous; and, at the bottom of some of the wells, the slate begins to exhibit thin veins of coal, distributed in great numbers through the substance of the slate, which is the shale of the miners. The coal is from the thickness of a knife-blade to that of a finger; it is highly bituminous, and burns with great freedom. Even the entire masses of the stone burn brilliantly, when ignited on a common fire; and, after exhaustion of the coally matter, leave the slate of a grayish colour. The locality from which the specimens were taken, is on the land of Roswell Moore, Esq. about midway between Hartford and New Haven. The spot was lately examined by Col. Gibbs, Eli Whitney, Esq. Professor Olmstead, and others; and arrangements are making to bore the strata, to the depth of several hundred feet, if necessary. These localities are in what may, with propriety, be called the coal formation of Connecticut. Coal has been found in several other places in that state; and the peculiar geological features of the region in which it is contained, are very interesting, and may hereafter be described in form.