ILLUSTRATIONS XXV 



FIG. PAGE 



72. THE EARLIEST KNOWN PICTURE or CELLS, FROM HOOKE'S Micro- 



graphia (1665), ......... 238 



73. SKETCH FROM MALPIGHI'S TREATISE ON THE ANATOMY OF PLANTS 



(1670), 239 



74. THEODOR SCHWANN, 1810-1882, 245 



75. M. SCHLEIDEN, 1804-1881, . 246 



76. THE EGG AND EARLY STAGES IN ITS DEVELOPMENT (AFTER GE- 



GENBAUR), 253 



77. AN EARLY STAGE IN THE DEVELOPMENT OF THE EGG OF A ROCK 



LIMPET (AFTER CONKLIN), 254 



HIGHLY MAGNIFIED TISSUE-CELLS FROM THE SKIN OF A SALA- 

 MANDER (AFTER WILSON), 255 



79. DIAGRAM OF THE CHIEF STEPS IN CELL-DIVISION (AFTER PARKER), 256 



80. DIAGRAM OF A CELL (MODIFIED AFTER WILSON), . . .257 



81. (A) ROTATION OF PROTOPLASM IN CELLS OF NITELLA. (B) HIGH- 



LY MAGNIFIED CELLS OF A TRADESCANTIA PLANT, SHOWING 



CIRCULATION OF PROTOPLASM (AFTER SEDGWICK AND WILSON), 261 



82. FELIX DUJARDIN, 1801-1860, 265 



83. PURKINJE, 1787-1869, 267 



84. CARL NAGELI, 1817-1891, 268 



85. HUGO VON MOHL, 1805-1872, 269 



86. FERDINAND COHN, 1828-1898, 271 



87. HEINRICH ANTON DE BARY, 1831-1888, 272 



88. MAX SCHULTZE, 1825-1874, 273 



89. FRANCESCO REDI, 1626-1697, 280 



90. LAZZARO SPALLANZANI, 1729-1799, 283 



91. APPARATUS OF TYNDALL FOR EXPERIMENTING ON SPONTANEOUS 



GENERATION, . 290 



92. Louis PASTEUR (1822-1895) AND His GRANDDAUGHTER, . . 295 



93. ROBERT KOCH, 1843-1910, . . . . . . . 301 



94. SIR JOSEPH LISTER, 1827-1912, ...... 302 



940. FRITZ SCHAUDINN, 1871-1906, .... . 304 



95. GREGOR MENDEL, 1822-1884, .... . 316 



96. FRANCIS GALTON, 1822-1911, 319 



97. CHARLES LYELL, 1797-1875, . . 333 



98. PROFESSOR OWEN AND THE EXTINCT FOSSIL BIRD OF NEW ZEA- 



LAND, .335 



99. Louis AGASSIZ, 1807-1873, . . . . . . 336 



100. E. D. COPE, 1840-1897, . . . .338 



101. O. C. MARSH, 1831-1899, 339 



102. Karl VON ZITTEL, 1839-1904, 341 



103. TRANSMUTATIONS OF PALUDINA (AFTER NEUMAYER), . . 354 



104. PLANORBIS SHELLS FROM STEINHEIM (AFTER HYATT), . . 355 



