XXVI 



ILLUSTRATIONS 



FIG. 

 105. 

 106. 

 107. 



108. 

 109. 



IIO. 

 III. 



112. 



113. 

 114. 



ii5- 

 116. 

 117. 

 108. 

 119. 

 120. 

 121. 

 122. 

 123. 



Bones of the Foreleg of a Horse, ..... 



Bones of Fossil Ancestors of the Horse, 



Representation of the Ancestor of the Horse Drawn by 

 Charles R. Knight under the Direction of Professor 

 Osborn. Permission of the American Museum of Natural 

 History, 



Fossil Remains of a Primitive Bird (Arch^eopteryx), 



Gill-clefts of a Shark Compared with those of the Em- 

 bryonic Chick and Rabbit, ...... 



Jaws of an Embryonic Whale, showing Rudimentary Teeth, 



Profile Reconstructions of the Skulls of Living and of 

 Fossil Men, 



Lamarck, 1 744-1829, 



Charles Darwin, 1809-1882, 



August Weismann, 1834-1914, 



Hugo de Vries, . 



Buffon, 1 707-1 788, 



Erasmus DarWin, 1 731-1802, 



Geoffroy Saint Hilaire, 1 772-1844, 



Charles Darwin, 1809-1882, 



Alfred Russel Wallace, 1823-1913, 



Thomas Henry Huxley, 1825-1895, 



Ernst Haeckel, born 1834, 



The Biological Station at Naples, 



page 

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