XXIV ILLUSTRATIONS 



FIG. PAGE 



30. Nervous System of the Cockchafer, from Straus-Durck- 



heim's Monograph (1828), . . . . . . .101 



31. Ehrenberg, 1 795-1876, . . 108 



32. Gesner, 1516-1565, 114 



33. John Ray, 1628-1705, 116 



34. Linnaeus (1 707-1 778) at Sixty, 124 



35. Karl Th. von Siebold, . . . . . . .135 



36. Rudolph Leuckart, 136 



37. Severinus, 1580-1656, 142 



38. Camper, 1 772-1 789, 144 



39. John Hunter, 17 28-1 793, 145 



40. Vicq d'Azyr, 1 748-1 794, 147 



41. Cuvier (1769-1829) as a Young Man, . . . . .152 



42. Cuvier at the Zenith of His Power, 153 



43. H. Milne-Edwards, 1800-1885, 157 



44. Lacaze-Duthiers, 1821-1901, 159 



45. Lorenzo Oken, 1779-1851, 160 



46. Richard Owen, 1804-1892, 161 



47. J. Fr. Meckel, 1781-1833, 162 



48. Karl Gegenbaur, 1826-1903, 164 



49. Bichat, 1771-1801, 169 



50. Von Koelliker, 1817-1905, 173 



51. Rudolph Virchow, 1 821-1903, 174 



52. Franz Leydig, 1821-1908 175 



53. S. Ramon y Cajal, 176 



54. Albrecht Haller, 1 708-1 7 77, 182 



55. Charles Bell, 1 774-1842, . 184 



56. Johannes Muller, 1801-1858, 187 



57. Ludwig, 1816-1895, 188 



58. Du Bois-Reymond, 1818-1896, 189 



59. Claude Bernard, 1813-1878, 191 



60. Frontispiece of Harvey's Generatione Animalium (165 1), .201 



61. Selected Sketches from Malpighi's Works, . . . 203 



62. Marcello Malpighi, 1 628-1 694, 204 



63. Plate from Wolff's Theoria Generationis (1759), . . . 209 



64. Charles Bonnet, 1 720-1 793, 212 



65. Karl Ernst von Baer, 1 792-1876, 216 



66. Von Baer at about Seventy Years of Age, . . . .217 



67. Sketches from Von Baer's Embryological Treatise (1828), 221 



68. A. Kowalevsky, 1840-1901, . . . . . s . . 225 



69. Francis M. Balfour, 1851-1882, 227 



70. OSKAR HERTWIG IN 1890, 23 1 



71. Wilhelm His, 1831-1904, 233 



