BY THE SAME AUTHOR. 



HABIT AND INTELLIGENCE, 



IN THEIR CONNECTION WITH THE LAWS 

 OF MATTER AND FORCE. 



A SERIES OF SCIENTIFIC ESS A VS. 

 Second Edition. 8vo. i6s. 



' ' In the present edition chapters have been inserted on the Facts of 

 Variation, on the Effect of Change of Conditions, and on Mimicry, 

 Colour, and Sexual Selection. These are mostly abstracted from the 

 enormous mass of detail noted in Darwin s works ; and I hope that they 

 may be not only serviceable in illustrating the reasonings of this work, but 

 useful in themselves as constituting an accurate and readable summary 

 of interesting and important facts. The following chapters are also 

 altogether new, and are the most original in the work : 

 Classification and Parallel Variation (Chapter XIII. } 

 Classification and the Fixation of Characters (Chapter XIV. } 

 Structure in Anticipation of Function (Chapter XVIII.} 

 The Origin of Man (Chapter XIX. ) 

 Automatism (Chapter XXXII.} 



The chapter on Metamorphosis and Metagenesis is mostly new. The 

 psychological chapters are rewritten and much improved ; and there 

 are few chapters which are not in a considerable degree re-written." 

 From the " Preface to the Second Edition." 



SATURDAY REVIEW" We are pleased to listen to a writer who has 

 so firm a foothold upon the ground within the scope of his immediate survey, and 

 who can enunciate with so much clearness and force propositions which come 

 within his grasp. There is much boldness and breadth in his conception of his 

 subject, and much fresh and genuine ability in his mode of making good his main 

 propositions." 



BRITISH QUARTERLY REVIEW "An exceedingly thoughtful and 

 suggestive volume." 



SCOTSMAN " Whether the reader accepts the conclusion arrived at or not, 

 in no other work in the English language will he find an abler or a fairer state- 

 ment both of the weak and the strong points of present life theories." 



MACMILLAN AND CO., LONDON. 



