ILLUSTRATIONS 



XXV 



83- 

 84. 



85. 



86. 



87. 



89. 

 90. 

 91. 



92. 



93- 

 94. 

 94a 



95- 

 96. 



97- 



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



graphia (1665), 



Sketch from Malpighi's Treatise on the Anatomy of Plants 



(1670), 



Theodor Schwann, 1810-1882, 



m. schleiden, 1804-1881, 



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



genbaur), 



\\ Karly Stage in the Development of the Egg of a Rock 



Limpet (after Conklin), 



Highly Magnified Tissue-Cells from the Skin of a Sala- 

 mander (after Wilson), . 



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

 Diagram of a Cell (modified after Wilson), . 

 {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), 



Felix Dujardin, 1801-1860, 



Purkinje, 1 787-1869, 



Carl Nageli, 1817-1891, 



Hugo von Mohl, 1805-1872, 269 



Ferdinand Cohn, 1828-1898, 271 



Heinrich Anton De Bary, 1831-1888, 272 



Max Schultze, 1825-1874, 273 



Francesco Redi, 1626-169 7, 280 



Lazzaro Spallanzani, 1 729-1 799, 283 



Apparatus of Tyndall for Experimenting on Spontaneous 



Generation, 290 



Louis Pasteur (1822-1895) and His Granddaughter, . . 295 



238 



239 



245 

 246 



253 



254 



255 

 256 



257 



261 

 265 



267 

 268 



Robert Koch, 1843-1910, 

 Sir Joseph Lister, 1827-1912, 

 . Fritz Schaudinn, 1 871-1906, 

 Gregor Mendel, 1822-1884, 

 Francis Galton, 1822-1911, 

 Charles Lyell, i 797-1875, . 

 Professor Owen and the Extinct Fossil Bird of New 



land, .... 



Louis Agassiz, 1807-1873, 

 E. D. Cope, 1840-1897, 

 O. C. Marsh, 1831-1899, 

 Karl von Zittel, 1 839-1 904, 



Transmutations of Paludina (after Neumayer), 

 Planorbis Shells from Steinheim (after Hyatt), 



Zea- 



301 



302 



304 



316 



319 

 333 



 335 



• 336 



 338 



• 339 



• 34i 



• 354 



• 355 



