List of Plates. XI 



Facing pajje. 



53. Meriwether I^ewis (1774-1809), explorer. From an enj^ravinjj by Strick- 



land 27S 



54. James Harvey Linsley ( 1 787-1 843), naturalist. From a steel engraving. . 2S2 



55. Stephen Harriman Long (1784- 1864), army explorer. From an engraving 



by J. C. Buttre of a daguerreotype portrait 2S6 



56. \Villiam Maclure ( 1763-1840), geologist. From an engraving of a painting 



by Thomas Sulh' 290 



57. Matthew Fontaine Maury (1806-1873), geographer. From an engraving 



by George E. Ferine 294 



58. Francois Andre Michaux ( 1770-1855), botanist. From an engraving b}' 



H. B. Hall of a painting by Rembrandt Peale 298 



59. Ormsby MacKnight Mitchel (1809-1862), astronomer. From an engraving 



by J. C. Buttre 302 



60. Samuel Latham Mitchill (1764-1831), "Nestor of American vScience." 



From an engraving of a painting by H. Inman 306 



61. Sanmel George Morton (1799-1851), physician. From an engraving 310 



62. Albert James Myer (1827-1880), chief .signal officer, U. S. A. From an 



engraving by William Murray 314 



63. John Strong Newberry ( 1822-1892), geologist. From a photograph 318 



64. Eliphalet Nott ( 1773-1866), president of Union College. From an engrav- 



ing by A. B. Durand of a painting by Ames 322 



65. Thomas Nuttall (1786-1859), naturalist. From an engraving by Thom- 



son 326 



66. Denison Olmsted (i 791-1859 ), ph3'sicist. From an engraving l)y A. H. 



Ritchie 330 



67. John Grubb Parke (1827-T900), army explorer. From an engraving by 



A. H. Ritchie 334 



68. Charles Willson Peale (1741-1827), artist. From a painting by himself . . 338 



69. Rembrandt Peale (1778-1860), artist. From a painting by Thomas vSully. 342 



70. Benjamin Peirce (1809-1880), mathematician. From a photograph 346 



71. Timothy Pickering (1745-1829), statesman. From an engraving by T. B. 



Welch of a painting by Gilbert Stuart 350 



72. Zebulon Montgomery Pike (1779-1813), army explorer. From an engrav- 



ing Ity Gimbred 354 



73. Joel Roberts Poinsett (1779-1851), statesman. From an engraving l)v 



J. B. Longacre 358 



74. Joseph Prie-stley (1773-1804), chemist. P'roni an engraving l)y W. I loll of 



a painting by Gilbert Stuart 362 



75. vSanmel Purchas (1577-1628), aiithor of " Pnrchas, his pilgrimagf." I'Vom 



an engraving by H. R. Cook 366 



76. Constantine Samuel Rafinesquc (1784-1842), n;itnralist. I'rom a wood 



cut reproduction of a steel engraving 370 



77. William C. Redfield ( 1789-1857), meteorologist. I'Vom an t'ugraving bv 



A. H. Ritchie 374 



78. Charles Valentine Riley (1843-1S95), entomologist. I'rom a photograph. 378 



79. David Rittenhouse ( 1 732-1 796), astronomer. PYoni an engraving by J. B. 



Longacre of a painting hy C. W. Peale 3S2 



80. John Rodgers ( 1812-1882), naval explorer. From an engraving l)v A. H. 



Ritchie 386 



81. Henry Darwin Rogers (1808-1866), gcologi.st. From an engraving bv 



L. S. Pundenson 390 



82. William Barton Rogers (1804-1882), founder of Massachusetts Institute of 



Technology. From an engraving by H. W. Smith 394 



