viii PREFACE. 



energy is wasted in a serious endeavour to do so, even though 

 to minds already persuaded it may seem unnecessary to have 

 slain our opponents in a manner quite so mercilessly minute. 

 Secondly, I must ask these friendly critics to take note that, 

 although the discussion has everywhere been thrown into the 

 form of an answer to objections, it really has a much wider 

 scope : it aims not only at an overthrow of adversaries, but 

 also, and even more, at an exposition of the principles 

 which have probably been concerned in the " Origin of 

 Human Faculty." 



The Diagram which is reproduced from my previous work 

 on " Mental Evolution in Animals," and which serves to 

 represent the leading features of psychogenesis throughout 

 the animal kingdom, will re-appear also in succeeding instal- 

 ments of the work, when it will be continued so as to represent 

 the principal stages of " Mental Evolution in Man." 



i8, Cornwall Terrace, Regent's Park, 

 July, 1888. 



