/ 1 ' ' 

 ail 1 Preface 



Hirth, professor of Chinese at Columbia University, of New York; to my 

 friend Paul Pelliot, professor at the College de France in Paris ; to Prof. 

 Georg Jacob at the University of Kiel; and to Dr. Julius Ruska at the 

 University of Heidelberg. The contributions courteously made by 

 these gentlemen are clearly acknowledged as such in each particular 

 instance. Berthold Laufer. 



