PRESIDENTIAL ADDRESS. 73 



Horace H. Hayden, of Baltimore [b. 1769? d. 1844], pub- 

 lished in 1820 " Geological Essays, or an inquiry into some of 

 the geological phenomena 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 published in this country. 

 Silliinan said that it should be a text-book in all the schools. 

 He published, also, a " New Method of preserving Ana- 

 tomical Preparations,"! " A Singular ore of Cobalt and Manga- 

 nese,"! on "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 (1830-40) the leading spirits were Silli- 

 inan, Hare, Olmstead, Hitchcock, Torrey, DeKay, 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 States Coast Survey, discontinued 

 in i Si 8, was reorganized under the direction of its first chief, 

 Hassler, now advanced in years.^f 



The natural history survey of New York was organized by the 



* Rev. Sill. Journ., iii, 47. Blackwood's Mag., xvi, 420; xvii, 56. 



t American Medical Record, 1822. 



| Ibid. 1832. || Silliman's Journal, 1822. 



Journ. Amer. Silk Company, 1839. 



^Proc. Amer. Assoc. Adv. Sei., H, 163. 



