X List of Plates. 



Facing page. 



21. Charles Henry Davis (1807-1877), naval explorer. From an engraving 



by A. H. Ritchie 146 



22. Edwin Hamilton Davis (1811-1888), ethnologist. From a copy of a 



photograph 150 



23. John William Draper (1811-1SS2), physicist. From an engraving by 



George E. Ferine I54 



24. Peter Stephen Duponceati (1760-1844), philologist. From a lithograph. . 158 



25. Timothy Dwiglit (1752-1817), president of Yale College. From an 



engraving b)' Freeman 162 



26. James Buchanan Eads (1820-1887), civil engineer. From an engraving 



by A. H. Ritchie 166 



27. Amos Eaton ( 1 776-1 842), botanist. From an engraving by A. H. Ritchie . 170 



28. Andrew Ellicott (1758-1820), f^^tronomer and civil engineer. From a 



photograph of a painting 174 



29. George William Featherstonhaugh (1780-1866), explorer and geologist. 



From a photograph 178 



30. William Ferrell (1817-1891), meteorologist. From a photograph 182 



31. John Reinliold (1729-1798) and John George (1754-1794) Forster, natu- 



ralists. From an engraving by D. Berger 186 



32. Benjamin Franklin (1706- 1790), scientist. From an etching by Albert 



Rosenthal of the painting by C. W. Pealed 190 



33. John Charles Fremont (1813-1890), army explorer. From an engraving 



by T. Knight of a photograph 196 



34. George Gibbs (1815-1873), ethnologist. From a photograph 200 



35. James Melville Gilliss (1811-1865), astronomer. From a photograph 204 



36. Augustus Addison Gould (1805-1866), conchologist. From an engraving 



by Wright Smith 208 



37. Asa Gray (1810-1S88), botanist. From a wood engraving by G. Kruell . . 212 



38. Jacob Green (1790-1841), chemist. From an engraving by J. Sartain of 



a painting b}' H. Bridgport 216 



39. Arnold Guyot (1807-1884), geographer. From a photograph 220 



40. vStephen Hales ( 1677-1761), botanist. From a .steel engraving 224 



41. Charles Frederic Hartt (1840-1S78), naturalist and explorer. From a 



wood cut engraving of a photograph 228 



42. Ferdinand Rudolph Hassler (1770-1843), first superintendent of the U. S. 



Coast Surve3\ From a photograph of a painting 232 



43. Isaac Lsrael Hayes (1832-1881), Arctic explorer. From an engraving by 



Jackman 236 



44. Joseph Henry ( 1799- 1878), first secretary of the Smithsonian Institution. . 240 



45. Edward Hitchcock (1793-1864), geologist. From a photograph of a 



painting 244 



46. Eben Norton Horsford (18 18-1893), chemist. From an engraving 248 



47. David Hosack ( 1769-1835), botanist. From an engraving by A. B. Durand 



of a painting by Thomas Sully 252 



48. Andrew Atkinson Humphreys (1810-1883), army engineer. From an 



engraving by A. H. Ritchie 256 



49. David Humphreys (1752-1 818), poet and diplomatist. From an engraving 



by G. Parker of a painting by Gilbert Stuart 260 



50. Elisha Kent Kane (1820-1857), Arctic explorer. From an engraving by 



T. B. Welch of a daguerreotype portrait by Brady 266 



51. Benjamin Henry Latrobe ( 1767-1820), civil engineer. From a lithograph. 270 



52. Isaac L,ea (1792-18S6), conchologist. From an etching by S. J. Ferris 274 



