PRESIDENTIAL ADDRESS. 73 



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

 lished in 1S30 '-Geological Essays, or an inquiry into some of 

 the creoloo-ical 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 apparentl}- 

 the first general work on geology published in this country. 

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

 He published, also, a " New Method of preserving x\na- 

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

 nese, "J 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- 

 man, 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. 



Henrv was just making his first discoveries in physics, having, 

 in 1S29, pointed out the possibility of electro-magnetism as a 

 motive power, and in 183 1 set up his first telegraphic circuit at 

 Albany. In 1S32 the United States Coast Survey, discontinued 

 in 1818, was i^eorganized under the direction of its first chief, 

 Hassler, now advanced in years. ^ 



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. 



J Ibid. 1832. II Silliman's Journal, 1822. 



§ Journ. Amer. Silk Company, 1839. 



H Proc. Amer. Assoc. Adv. Sci., ii, 163. 



