452 Memorial of George Droivn Goode. 



important advance, being the first to avail himself successfully of pale- 

 ontology for the determination of the age of several of our formations, 

 and their approximate synchronism with European beds. ' 



Horace H. Hayden, of Baltimore [b. 1769, d. 1844], published in 1820 

 Geological Essays, or an Inquiry into Some of the Geological Phe- 

 nomena to be Found in Various Parts of America and Elsewhere,'' which 

 was well received as a contribution to the history of alluvial formations 

 of the globe, and was apparently the first general work on geology pub- 

 lished in this country. Silliman said that it should be a text-book in all 

 the schools. He published, also, a New Method of Preserving Anatom- 

 ical Preparations,^ A Singular Ore of Cobalt and Manganese,'* A De- 

 scription of the Bare Hills near Baltimore, ^ and on Silk Cocoons,* and 

 was a founder and vice-president of the Maryland Academy of Sciences. 



XV. 



In the fourth decade (1830-1840) the leading spirits were Silliman, 

 Hare, Olmsted, Hitchcock, Torrey, De Kay, Henry, and Morse. 



Among the men just coming into prominence were J. W. Draper, then 

 professor in Hampden Sidney College, in Virginia, the brothers W. B. 

 and H. D. Rogers, A. A. Gould, the conchologist, and James D. Dana. 



Henry was just making his first discoveries in physics, having in 1829 

 pointed out the possibility of electro-magnetism as a motive power, and 

 in 1831 set up his first telegraphic circuit at Albany. In 1832 the United 

 Coast Survey, discontinued in 1818, was reorganized under the direction 

 of its first chief, Hassler, now advanced in years. ^ 



The natural-history surx^ey of New York was organized hy the State 

 in 1836, and James Hall and Ebenezer Emmons were placed upon its 

 staff. 



G. W. Featherstonhaugh [b. 1780, d. 1866] was conducting (1834-35) 

 a Government expedition, exploring the geology of the elevated coun- 

 try between the Missouri and Red rivers and the Wisconsin territories. 

 He bore the name of United States Geologist, and projected a geo- 

 logical map of the United States, which now, half a century later, is 

 being completed by the United States geologist of to-day. Beside his 

 report upon the survey just referred to, Featherstonhaugh printed a 

 Geological Reconnaissance, in 1835, from Green Bay to Coteau des 

 Prairies, and a Canoe Voyage up the Minnay Sotor, in Eondon, 1847. 



'Theodore Gill. 



^Reviewed in American Journal of Science, III, 1S21, ]>. 47, and in Blackwood's 

 Magazine, XVI, 1824, p. 420; XVII, 1825, p. 56. 



3 American Medical Recorder, VII, 1824, p. 223. 



'» American Journal of Science, IV, 1822, p, 283. 



5 Idem., XXIV, 1833, p. 349. 



* Journal of the American Silk Company, I, May, 1839, p. 179. 



' Proceedings of the American Association for the Advancement of Science, II, 

 1849, P- 163. 



