Xlii GEOLOGICAL AND PALEONTOLOGICAL RELATIONS 



1818. 



Maclure, Wm, Observations on the Geology of the United States 

 of America, with some remarks on the probable effect that may be 

 produced by the decomposition of the different classes of Rocks on the 

 nature and fertility of Soils. Two plates. 



Republished in Trans. Amer. Philos. Soc, vol. i, n. s., 1818, pp. 1-91. 

 • Leon. Zeit. 1, i826, pp. 124-138. 



MiTCHiLL, Samuel L. Cuvier's Essay on the Theory of the Earth. 

 To which are now added Observations on the Geolog}' of North America. 

 Svo. 431 pp. Plates. New York, 1818. 



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. 



Say, Thomas. Observations on some Species of Zoophytes, etc., prin- 

 cipally Fossil. 



Amer. Jour. Sci., 1820, vol. ii, pp. 34-45. 



1821. 



Nuttall, Thomas. Observations on the Geological Structure of the 

 Valley of the Mississippi. [Read Dec, 1820.] 



Jour. Acad. Nat. Sci., Phila., vol. ii. 1st. ser., 1821, pp. 14-52. 



1822. 

 Cleaveland, Parker. An elementary treatise on Mineralogy and 

 Geology. 6 plates. 2nd Edit, in 2 vols. Boston, 1822. 



1823. 



DiLLWYN, L. "W. Martini Lister Historia sive Synopsis Methoclicge 

 Conchyliarum. Editio tertia. Oxonii, 1823, 



1824. 



Finch, John. Geological Essay on the Tertiary Formations in Am- 

 erica. (Read Acad. Nat. Sci. Phiia., July 15, 1823.) 

 Amer. Jour. Sci., vol. vii, 1824, pp. 31-43. 



Say, Thomas. An Account of some of the Fossil Shells of Mary- 

 land. 



Jour. Acad. Nat. Sci., Phila., vol. iv, 1st ser., 1824, pp. 124-155. Plates 

 7-13. 



Reprinted Bull. Amer. Pal., vol. i. No. 5, 1896, pp. 30-76; pi. 7-12. 



