LIST OF ILLUSTRATIONS. 



PLATES. 



Contributions to the History of American Geology. n 



By George P. Merrill. 



Facing page. 



1. Maclure's Geological Map of the United States. Reduced from original 



in Transactions of the American Philosophical Society, VI, Pt. 2, 



1809 189 



2. Portrait of Benjamin Silliman, professor of chemistry, Yale College. From 



a steel engraving by W. (i. Jackman (D. Appleton & Co.) 215 



3. Portrait of William Maclure, president of the Philadelphia Academy of 



Natural Sciences. (After T. Sully. ) Engaved by D. C. Hinman 218 



4. Portrait of Parker Cleaveland, professor of chemistry and mineralogy, 



Bowdoin College. (After T. Badger.) Engraved by J. C. Buttre..'.. 226 



5. Maclure's Section across the Appalachians (colored). Reduced from 



original in Transactions of the American Philosophical Society, 1818... 228 



6. Portrait of Amos Eaton, professor of natural science, Rensselaer Polytech- 



nic Institute. From a wood engraving in Popular Science Monthly, 

 XXXVIII, 1890 234 



7. Eaton's Geological Segments. From Index to Geology of Northern States, 



1820 251 



8. Portrait of Ebenezer Emmons, State geologist of North Carolina. From 



a wood engraving in Popular Science Monthly, XL VIII, 1896 281 



9. Portrait of Gerard Troost, State geologist of Tennessee. From a wood 



engraving in Popular Science Monthly, XLV, 1894 283 



10. Portrait of Samuel George Morton, physician and paleontologist From 



a steel engraving -. 288 



11. Portrait of Charles Thomas Jackson, State geologist of Maine, New Hamp- 



shire, and Rhode Island. Redrawn from a woodcut by C. Weber 290 



12. Portrait of Lardner Vanuxem, geologist of New York State survey. From 



a wood engraving in Popular Science Monthly, XL VI, 1895 292 



13. Portrait of Edward Hitchcock, professor of geology, Amherst College. 



From a wood engraving in Popular Science Monthly, XL VI I, 1895 307 



14. Portrait of Henry Darwin Rogers, State geologist of Pennsylvania From 



a steel engraving bv L. S. Punderson, in Annual ot Scientific Discovery, 



1858 328 



15. Portrait of William Williams Mather, geologist of New York State survey. 



From a wood engraving in Popular Science Monthly, XLIX, 1896 333 



16. Portrait of William Barton Rogers, State geologist of Virginia. From a 



steel engraving by H. W. Smith, in Annual of Scientific Discovery, 1868. M41 



17. Portrait of Timothy Abbott Conrad, paleontologist. From a wood engrav- 



ing in Popular Science Monthly, X LVII, 1895 344 



18. Portrait of David Dale Owen, geologist. Redrawn from woodcut in 



Report on Geology of Wisconsin, Iowa, and Minnesota 350 



19. Owen's Geological Sections (colored). Reduced from original in Report 



ot Geological Reconnaissance ot Chippewa Land District 351 



20. Portrait of James Hall, State geologist of New York. From a photograph 



taken in 1891 379 



21. Portrait of James Dwight Dana, professor of geology, Yale College. From 



a photograph - 400 



22. River terraces and drift bowlders in Massachusetts. From Hitchcock's 



Illustrations of Surface Geology, 1857 462 



23. Portrait of John Strong Newberry, professor of geology, Columbia Col- 



lege, and State geologist of Ohio. From a steel engraving .. 180 



