238 BIBLIOGRAPHY AND CARTOGRAPHY

1819.

CORNELIUS, ELLAS. On the Geology, Mineralogy, Scenery and
Curiosities of Virginia, Tennessee and the Alabama and Mississippi
Territories, etc., with miscellaneous remarks in a letter to the editor.

Amer. Jour. Sci., vol. i, 1819, pp. 214-226.

Refers to " Point of Rocks " breccia without mentioning exact locality.

HAYDEN, H. H. Red Pyroxene Augite. Extract of a letter to the
editor from Dr. H. H. Hayden of Baltimore.

Amer. Jour. Sci., vol. i, 1819, p. 244.

This is an incidental reference in which no locality is given, and the description is
Insufficient to determine the true character of the mineral found.

1820.

HAYDEN, H. H. Geological Essays; or an Inquiry into some of the
Geological Phenomena to be found in various parts of America and
elsewhere. 8vo. pp. 412. Baltimore, 1820.

Cites Maryland localities, especially about Baltimore, in support of his theory.
Cites the finding of numerous mastodon teeth in Maryland.

1821.

NUTTALL, THOMAS. Observations on the Geological Structure of
the Valley of the Mississippi. (Read Dec., 1820.)

Jour. Acad. Nat. Sci. Phila., o. s. vol. ii, 1821, pp. 14-52.

Cites Annapolis as northern limit of the " second Calcareous formation," p. 35.

TROOST, G. Description of a variety of Amber and of a Fossil
Substance supposed to be the nest of an Insect discovered at Cape
Sable, Magothy River, Anne Arundel County, Maryland.

Amer. Jour. Sci., vol. iii, 1821, pp. 8-15.

Besides the descriptions are notes on the geological occurrence and associated min-
erals and fossils.

1822.

CLEAVELAND, PARKER. An elementary treatise on Mineralogy and
Geology. 6 plates. 2nd Edit, in 2 vols. Boston, 1822.

Frequent references to Maryland minerals. Maclure's map is reproduced.

SEYBERT, HENRY. Analysis of the American Chromal of Iron.

Amer. Jour. Sci., vol., iv, 1822, pp. 321-323.

The sample analyzed was obtained from the Bare Hills, Baltimore County, Md.

STRUVE, BARON VON. Beitrage zur Mineralogie und Geologic des
nordlichen Amerikas. 12mo. Hamburg, 1822.