ILLUSTRATIONS 



XXV 



FIG. 



72. 



75- 

 76. 



77- 

 78. 



79- 

 80. 



81. 



82. 



83- 

 84. 



85. 

 86. 



87. 

 88. 

 89. 

 90. 

 91. 



92. 



93- 

 94. 



94a 



95- 

 96. 



97- 

 98. 



99. 

 100. 



lOI. 



102. 

 103. 

 104. 



PAGE 



The Earliest Known Picture of Cells, from Hooke's Micro- 



graphia (1665), 238 



Sketch from Malpighi's Treatise on the Anatomy of Plants 



(1670), ■. . 239 



Theodor Schwann, 1810-1882, . . . . . . 245 



M. Schleiden, 1804-1881, 246 



The Egg and Early Stages in Its Development (after Ge- 



genbaur), 253 



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 



Diagram of the Chief Steps in Cell-Division (after Parker), 256 

 Diagram of a Cell (modified after Wilson), . . .257 

 {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 



. 265 

 . 267 

 . 268 

 . 269 

 . 271 

 . 272 



• 273 

 . 280 



. 283 



Felix Dujardin, 1801-1860, . 



Purkinje, 1 787-1869, '. 



Carl Nageli, 1817-1891, . 



Hugo von Mohl, 1805-1872, 



Ferdinand Cohn, i 828-1 898, ■ . 



Heinrich Anton De Bary, i 831-1888, 



Max Schultze, 1825-1874, 



Francesco Redi, 1626-1697, 



Lazzaro Spallanzani, 1 729-1 799, 



Apparatus of Tyndall for Experimenting on Spontaneous 



Generation, 



Louis Pasteur (1822-1895) and His Granddaughter, 



Robert Koch, 1843-1910, 



Slr Joseph Lister, 1827-1912, 



, Fritz Schaudinn, 1871-1906, 



Gregor Mendel, 1822-1884, 



Francis Galton, 1822-1911, 



Charles Lyell, 1797-1875, . "^ 



Professor Owen and the Extinct Fossil Bi 



land, . . *. . 



Louis Agassiz, 1807-1873, 

 E. D. Cope, 1840-1897, 

 O. C. Marsh, 1831-1899, 

 Karl von Zittel, 1839-1904, 



Transmutations of Paludina (after Neumayer), 

 Planorbis Shells from Steinheim (after Hyatt), 



rd of New 



Zea- 



290 



295 

 301 



302 



304 

 316 



319 



335 



33^ 

 339 

 341 

 354 

 355 



