LIST OF ILLUSTRATIONS. 



PLATES. 



Page. 



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



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



1809 Frontispiece. 



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



a steel engraving by W. G. Jackman (P. Appleton & Co. ) 215 



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



Natural Sciences. (After T. Sully.) Engraved 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, XLVIII, 1896 281 



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



engraving in Popular Science Monthly, XLV, 1 894 283 



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



a steel engraving 288 



1 1 . Portrait of Charles Thomas Jackson, State geologist of Maine, New Hamp- 



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



12. Portrait of Lardner A'anuxem, 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, XLVII, 1895 307 



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



a steel engraving by L. S. Punderson, in Annual of Scientific Piscovery, 



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 Piscovery, 1868. 341 



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



ing in Popular Science Monthly, XLVII, 1 895 344 



18. Portrait of Pavid Pale 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 of 



Geological Reconnaissance of Chippewa Land District 351 



201 



