Hg PIONEERS OF SCIENCE IN AMERICA. 



the County of Albany, N. Y., 1820; Geological Nomenclature 

 of North America, 1822 ; Geological and Agricultural Survey 

 of the District adjoining the Erie Canal, 1824; Geological 

 Text-Books, prepared for Popular Lectures on North American 

 Geology, 1830; and Geological Text-Book, for the Troy 

 class, 1841. 



