LIST OF ILLUSTRATIONS. 203 



Page. 



10. Map of Long's expeditions, 1819-20. From an account of an Expedition 



from Pittsburg to Rocky Mountains 246 



11. Geological Sections from the Allegheny to the Rocky Mountains. (After 



Edwin James. ) From report of Long's expedition, 1819-20 248 



12. Portrait of Horace H. Harden. From a painting, by permission of Mary- 



land geological survey 259 



IS. Portrait of Thomas Cooper at age of 70. From a steel engraving by 



A. B. Durand 261 



14. Supposed human footprints in limestone. (After D. D. Owen.) From 



American Journal of Science, XLIII, 1842 263 



15. Portrait of Denison Olmsted. From a steel engraving by A. H. Ritchie. 267 



16. Map showing Routes of Long's expedition of 1823. From Narrative of 



an Expedition to the Source of St. Peters River 275 



17. Sections of Snake Hill, Saratoga Lake. (After J. H. Steel.) From Amer- 



ican Journal of Science, 1825 277 



18. Portrait of Elisha Mitchell. From a steel engraving 285 



19. Eaton's Transverse Sections of the Globe. From Geological Text-Book, 



1832 297 



20. Portrait of George William Featherstonhaugh. From American Geol- 



ogist, April, 1889 303 



21. Portrait of Jacob Green. From a steel engraving 305 



22. Folded axes. (After Edward Hitchcock.) From Final Report on Geology 



of Massachusetts, II, 1841 314 



23. Portrait of Isaac Lea. From a steel engraving in the Annual of Scientific 



Discovery, 1860 320 



24. Portrait of Julius Timoleon Ducatel. From a painting, by permission of 



Maryland geological survey 323 



25. Portrait of James Gates Percival. From an engraving 329 



26. Portrait of Samuel Prescott Hildreth. From a photograph 331 



27. Page from Mather's Elements of Geology for the use of schools, 1833. 



(Reproduced exact size) 334 



28. Portrait of Abraham Gesner. From an engraving in Bulletin XIV, Natural 



History Society of New Brunswick, 1896 339 



29. Portrait of Charles Upham Shepard. From a lithograph by Engelbach.. 340 



30. Portrait of James Curtis Booth. From a photograph taken in 1876 349 



31. Portrait of Bela Hubbard. From an engraving in Magazine of Western 



History 360 



32. General section across the Western States. (After D. D. Owen.) From 



Quarterly Journal of the Geol< igical Society of London, 1846 369 



33. Portrait of James Hall. From a daguerreotype taken in 1843 381 



34. Profile of the Island of New York. (After Issachar Cozzens. ) From Geo- 



logical History of Manhattan Island, 1843. (Original colored) 385 



35. Portrait of Michael Tuomey. From a photograph taken about 1857 387 



36. Portrait of Charles Baker Adams. From an enlarged engraving in Amer- 



ican Geologist, XXXII, 1903 391 



37. Ideal section of the crust of the earth. (After C. B. Adams. ) From First 



Annual Report Geologist of Vermont, 1845 392 



38. Portrait of Zadock Thompson. From a steel engraving by J. C. Buttre 393 



39. Richmond bowlder train. (After E. Hitchcock.) From American Journal 



of Science, XXXIX, 1845 394 



40. Portrait of Frederick Adolphus Wislizenus. From a photograph 398 



41. Portrait of James Dwight Dana. From a lithograph by R. Hoffman, 1857. . 401 



