ILLUSTRATIONS 



THOMAS HENRY HUXLEY — From a photograph by 

 London Stereoscopic Company . Frontispiece 



THOMAS HENRY HUXLEY, 1^^']— Reproduced by 

 permissio)i from ''Natural Science,'" vol. vii., 

 No. 42 64 



SIR JOSEPH DALTON HOOKER — From a photoffraph 



by Elliott and Fry, London .... 98 



CHARLES DARWIN — From the painting by Hon. 



John Collier in the N^ational Portrait Gallery, 146 



SIR CHARLES LYELL — From a photograph by Lon- 

 don Stereoscopic Company .... 236 



CARICATURE OF HUXLEY DRAWN BY HIMSELF — 



Reproduced bv permission from '' Nattcral 

 Science,'" vol. vii., No. ^6 . . . . 276 



xin 



