CONTENTS 



PAGE 



Introduction: Mutation, Mendelism, and Natural 

 Selection xiii 



I. A Naturalist's contribution to the Dis- 

 cussion upon the Age of the Earth 

 (Liverpool, 1896) i 



II. 'What is a Species ?' (London, 1904) . . 46 



in. Theories of Evolution (Boston, 1894) . . 95 



IV. Theories of Heredity (Oxford, 1889) . .120 



V. The Bearing of the Study of Insects upon 

 THE Question ' Are Acquired Charac- 

 ters Hereditary?' (London, 1905) . . 139 



VI. A Remarkable anticipation of Modern 



Views on Evolution (1897) . . . * ^73 



VII. Thomas Henry Huxley and the Theory 



OF Natural Selection (Birmingham, 1905) . 193 



VIII. Natural Selection the Cause of Mimetic 

 Resemblance and Common Warning 

 Colours (London, 1898) 220 



IX. Mimicry and Natural Selection (Berlin, 1901) 271 



X. The Place of Mimicry in a Scheme of 



Defensive Coloration (Leeds, 1890) . . 293 



Appendix : A Classification and Index of the 

 Examples of Mimicry quoted in the Text . 383 



Analytical Index 395 



