xxvi ILLUSTRATIONS 



FIG. PAGE 



105. BONES OF THE FORELEG OF A HORSE, 358 



106. BONES OF FOSSIL ANCESTORS OF THE HORSE, . . . 359 



107. 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, 361 



108. FOSSIL REMAINS OF A PRIMITIVE BIRD (ARCH^EOPTERYX), . 362 



109. GILL-CLEFTS OF A SHARK COMPARED WITH THOSE OF THE EM- 



BRYONIC CHICK AND RABBIT, 363 



no. JAWS OF AN EMBRYONIC WHALE, SHOWING RUDIMENTARY TEETH, 364 

 in. PROFILE RECONSTRUCTIONS OF THE SKULLS OF LIVING AND OF 



FOSSIL MEN, . . . . . . . . 371 



112. LAMARCK, 1744-1829, ... .379 



113. CHARLES DARWIN, 1809-1882, 387 



114. AUGUST WEISMANN, 1834-1914, .... . . . 406 



115. HUGO DE VRIES, . . . . . . . . . 409 



116. BUFFON, 1707-1788, . . 420 



117. ERASMUS DARWIN, 1731-1802, "... . . . 421 



108. GEOFFROY SAINT HILAIRE, 1772-1844, 424 



119. CHARLES DARWIN, 1809-1882, . . . . . . 431 



120. ALFRED RUSSEL WALLACE, 1823-1913, ... . 436 



121. THOMAS HENRY HUXLEY, 1825-1895, ..... 438 



122. ERNST HAECKEL, BORN 1834, 440 



123. THE BIOLOGICAL STATION AT NAPLES, 453 



