ILLUSTRATIONS 



XXV 



FIG. 



72. 



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 76. 



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 78. 



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 84. 



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 86. 



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 10:;. 



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), 255 



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 S.a.la- 



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 



Felix Duj.ardin, 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, 1831-1888, 



Max Schultze, 1825-1874, 



Francesco Redi, i 626-1697, 



Lazzaro Spallanzani, 1 729-1 799, .... 

 Apparatus of Ty'ndall for Experimenting on Spontaneous 



Generation, 



Louis Pasteur (182 2-1 895) and His Granddaughter, 



Robert Koch, born 1843, 



Sir Joseph Lister, born 1827, 



Gregor Mendel, 1822-1884, 



Francis Galton, born 1822, 



Charles Lyell, i 797-1875, 



Professor Owen and the Extinct Fossil Bird of New Zea 



LAND, 



Louis Agassiz, 1807-1873, 



E. D. Cope, 1840-1897, 



O. C. M.A.RSH, 1831-1899, 



Karl von Zittel, 1839-1904, ..... 

 Transmutations of Paludina (after Neumayer), 

 Planorbis Shells from Steinheim (after Hyatt), . 

 Bones of the Foreleg of a Horse, 



265 

 267 

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 271 

 272 



273 

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283 



290 

 295 



301 



302 



315 



334 



337 

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 352 

 353 

 356 



