INTRODUCTORY NOTE 



THOUGH the manuscript of this book was left in the 

 form of a connected draft, it was not in final form for 

 publication at the time of Dr. Herter's death. This 

 applies more particularly to the chapters here grouped 

 under book four, which do not fairly represent the 

 full development of the author's thought as indicated 

 by many additional notes, and by complete but 

 unconnected passages by which they are accom- 

 panied. A more extensive treatment, especially 

 of the eleventh chapter, had been planned; the 

 substance of the two following ones was represented 

 by three separate drafts, each of which contained a 

 considerable amount of material not duplicated in 

 the others. The most complete of these drafts is 

 here printed, with the addition of a few short pas- 

 sages from the other two. 



In editing the manuscript for the press, no essen- 

 tial alterations in plan or treatment have been made, 

 but a few minor changes have seemed necessary. 

 The five long chapters of the original draft have been 

 subdivided into fourteen shorter ones and have 

 been grouped in four " Books." A few passages that 

 involved a certain amount of repetition have been 

 omitted, a few have been altered in sequence, and 



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