Comment by Ed. This area, known to geologists as the "Cincinnati anticline," is co-extensive with the fertile blue grass lands. It consists essentially of an island of Ordovician (Lower Silurian) limestone, surrounded by the later systems. The Ordovician system is especially characterized by mollusca of the cephalopod class, to which Orthoceras belongs, while the Ammonites do not appear below the Devonian.
[024] Cincinnati College, the forerunner of Cincinnati University, grew out of a school established in 1814 on the model of the new English system of Lancaster and Bell. The college was chartered in 1815. Possibly the reference is to the recently-established medical college, for which see Nuttall's Journal, in our volume xiii, note 35.—Ed.
[025] Population by census of 1820, 9,642; of 1830, 24,831.—Ed.
[026] The Cincinnati mounds are now obliterated. A good description of them, with diagram, is given in Smithsonian Contributions to Knowledge (Washington, 1852), iii, art. vii.—Ed.
[027] Voy. a l' ouest des monts Alleghany, 1804. p. 93.—James.
Comment by Ed. See F. A. Michaux's Travels, in our volume iii, p. 175.
[028] Pers. Nar. vol. i. p. 357. Philadelphia Edition.—James.
[029] Salt's Abyssinia, p. 49. Amer. Edit.—James.
[030] The cotton-wood-tree is of very rapid growth. It has been ascertained that one individual, in the term of twenty-one years, attained the height of one hundred and eight feet, and nine inches, and the diameter of twenty and an half inches, exclusive of the bark. Barton's Supp. Med. and Phys. Jour. p. 71.—James.
[031] Sir James Edward Smith (1759-1828), founder and first president of the Linnæan Society (1788).—Ed.