POSTSCRIPT. 



THERE are few points in the foregoing book as to which 

 any words of mine arc needed. The differences be- 

 tween the original and the translation are very slight. I 

 have omitted a few lines from the preface to the third 

 edition, referring merely to changes which do not touch the 

 English reader. I have also divided the book into Parts 

 and Chapters instead of printing it continuously, as in the 

 German, from beginning to cud without break. I have in 

 a few cases added the date of the edition of the English 

 books quoted, and have corrected the page reference when 

 that of the edition used was not the same as that quoted 

 from by Dr. Buchner. In most cases of quotations from 

 English books, I have taken them directly from the 

 originals, instead of retranslating. Here and there I have 

 added a note, marking it by placing it between square 

 brackets and signing it "Tn." A few points touching 

 which I was doubtful have been referred to Dr. Buchner, 

 so as to insure perfect accuracy, and my thanks are due 

 to the great German author for his ready and ever-kindly 

 assistance. I also owe thanks and recognition to my friend 

 Dr. Edward Aveling for reading over a great part of the 

 proofs. 



ANNIE BBS ANT. 

 Jam/dry 13//>, 1881. 



