MARYLAND GEOLOGICAL SURVEY 53 



1845. 



Lyell, Chas. Travels in North America, with Geological Observa- 

 tions on the United States, Canada and Nova Scotia. New York, 1845. 

 2 vols. 12mo. 



Another edition, London, 1845, 2 vols., 12mo. 



Second English edition, London, 1855. 



German edition, translated by E. T. Wolff, Halle, 1846. 



1850. 



Higgins, Jas. Eeport of James Higgins, M. D., State Agricultural 

 Chemist, to the House of Delegates. Annapolis, 1850. 8vo. 92 pp. 

 Md. House of Delegates, Dec. Sess. [G]. 



1852. 



Desor, E. Post Pliocene of the Southern States and its relation 

 to the Laurentian of the North and the Deposits of the Valley of the 

 Mississippi. > , 



Amer. Jour. Sci., 2nd ser., vol. xiv, 1852, pp. 49-59. 



Fisher, E. S. Gazetteer of the State of Maryland compiled from 

 the returns of the Seventh Census of the United States. New York 

 and Baltimore, 1852, 8vo, 122 pp. 



Lyell, Chas. Travels in North America, in the years 1841-2; with 

 Geological Observations on the United States, Canada, and Nova Scotia. 

 New York, 1852. 2 vols. 



1853. 



Conrad, T. A. Descriptions of New Fossil shells of the United 

 States. 



Jour. Acad. Nat. Sci. Phila., 2nd ser., vol. ii, 1853, pp. 273-276. 



1858. 



Marcou, J. Geology of North America. Zurich, 1858. 4to. 



Eogers, H. D. The Geology of Pennsylvania. Phila., 1858. 4to. 

 2 vols. [vol. II in two parts] and maps. 



1859. 



Gabb, W. M. Description of some new Species of Cretaceous 

 Fossils. 



Jour. Acad. Nat. Sci., Phila., 2nd ser., vol. iv, 1858-1860, pp. 299-305. 



