College 

 Library 





P BE FACE. 



I HAD originally intended to publish the two volumes 

 which should form the second section of this work, 

 dealing with the History of Philosophical Thought during 

 the Nineteenth Century, together. With this intention I 

 wrote the text of both volumes, with the exception of a 

 closing chapter. When, however, after the lapse of many 

 years I returned to the revision and the working up of 

 the notes and references, I found that in the meantime 

 the whole subject had in my own mind acquired a some- 

 what altered aspect, and that to give expression to this 

 I had to introduce important changes and additions. As 

 to carry these out much more time was required than I 

 had expected, I have given way to the wish of some of 

 my friends, as also to my own growing conviction, that it 

 would be better to publish the third volume by itself and 

 let the fourth follow as soon as possible. I cannot help 

 feeling that this is somewhat unfair to my readers and 

 critics, as the whole subject cannot so easily be divided 

 into separate tolerably independent parts as seemed pos- 

 sible in the first section. I have, however, missed no 



