PREFACE 



THE second and final volume of this work consists of 

 two portions. I first bring to a conclusion the discussion 

 on which I embarked in Volume I., regarding the subject 

 from the point of view of " Science," and then in the longer 

 and more important portion I proceed to the " Philosophy ' 

 of the Organism. 



The third part of the scientific section, with which this 

 volume opens, is, so to say, an enlarged and improved 

 second edition of my work, Die " Seele ' als elementarer 

 Naturfaktor (1903). In the course of the argument it will 

 become apparent why the word Seele was put in inverted 

 commas in the German title. 



Of the philosophical section only Part I. B I and 2 

 (pp. 162-188) contains matter that I have already published 

 elsewhere in Part I. of my Naturbegriffe und Natururteile 

 (1904) and even this part is here presented to the reader 

 in a form very different from what it was. All the rest is 

 new and hitherto unpublished. 



I may say here that I myself regard Part I. B 3 to 5 



