I 



EARTO 



SCIENCES 



DISTRICT OF MARYLAND, ss. 



BE IT REMEMBERED, That on the 8th day of November, in the Forty- 

 fifth year of the Independence of the United States of America, Horace 

 4*1******** H. Hayden of the said District, hath deposited in this Office the title of 

 fSKAL.* a Book, the right whereof he claims as proprietor in the words following, 

 *********** to wit: 



" Geological Essays ; or, an Inquiry into some of the Geological Phenomena to 

 be found in "various parts of America, and elsewhere. By Horace H. Hayden, Esq. 

 Member of the American Geological Society Honorary Member of the Medical 

 Society of Maryland and of the Western Museum Society, and Corresponding 

 Member oi the Academy of Science at Philadelphia. 



Je sais que de nos jours les conjectures, les hypotheses sont proscrites de 1'etude de la nature, 

 et qu'on les regarde commeplus propres a retard'-r la marche tie la science qu & lu'i faire fairedes 

 progrs ; et rifn u'est plus vrai en general ; mais quand ces conjectures sont fondees sur des ana- 

 logics et sur des rapprochemens de fails, et de grands faits geulogiques, je ne pense nullement 

 qu'.lles soient inutiles et qu'on doive les proscrire. Ellcs etendent les vues de 1'obsenateur, 

 et lui font remarquer des rapports qui lui auroient el>appe. Pairing 



In conformity to an act 01 the Congress of the United States, entitled, " An 

 acl for* *h4 Encouragement of learning, by securing the copies of maps, charts, 

 and books, to the authors and proprietors of such copies during the times therein 

 mentioned." And also to the act, entitled, " An act supplementary to an act, 

 entitled, " An act for the encouragement of learning, by securing the copies of 

 maps, charts, and books, to the authors and proprietors of such copies during 

 the times thei-ein mentioned," and extending the benefits thereof to the arts of 

 designing, engraving, and etching historical and other prints." 



PHILIP MOORE, 

 Clerk of the District of Maryland, 



