LIST OF ILLUSTRATIONS. XIII 



Facing page. 



6. Various types of flint implements. Fayum, Egypt 752 



7. Flint implements. Fayum, Egypt 752 



8. Arrow and javelin heads, saws, etc. Fayum, Egypt 752 



9. Saws and other implements of flint. Fayum, Egypt 752 



] 0. Arrowheads of remarkable form. Fayum, Egypt 752 



1 1 . Scrapers, knives, drills, etc. Fayum, Egypt 752 



12. Spearheads, sacrificial knives, etc. Fayum, Egypt 752 



TEXT FIGURES. 



Contributions to the History of American Geology. 



By George P. Merrill. 



Page. 



1. Portrait of Archibald Bruce. From American Journal of Science, 1, 1819. 223 



2. Portrait of Samuel Luther Dana. From a wood engraving in Popular 



Science Monthly, XLIX, 1896 229 



3. Portrait of Samuel Latham Mitchill. From a steel engraving by Gimber 



and Dick 2:51 



4. Map to illustrate Mitchill's theory 'of barriers 232 



5. A geological transverse section, extending from Catskill Mountain to the 



Atlantic. From Eaton's Index to Geology of the Northern States, 1818. 235 



6. Portrait of Henry Rowe Schoolcraft. From a steel engraving by Illman 



& Sons 240 



7. Map showing Schoolcraft's route in 1820 .'. 241 



8. Map of Schoolcraft's travels in 1821 242 



9. Schoolcraft's Section of Presque Isle. (Original colored.) From Narrative 



Journal of Travels, 1820 243 



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. Hayden. From a painting by permission of Mary- 



land geological survey . . . ^ 259 



13. 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 



1!>. Eaton's Transverse Sections of the Globe. From Geological Text-Book, 1832 297 



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



gist, 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 •'! 1 4 



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 engravjng 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 ) 384 



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



ral History Society of New Brunswick, 1896 339 



