TRANSLATOR'S NOTE. 



THE translator wishes to express his sincere thanks to Professor 

 Ladenburg for the very cordial manner in which he agreed to 

 the preparation of this translation of his well-known history ; 

 as well as for his kindness in specially writing an additional 

 lecture for this edition, thereby bringing the latter up to date, 

 and for the great care he bestowed upon the revision of the 

 proof-sheets. He further wishes to thank a number of friends 

 to whom he is indebted for advice and assistance upon a variety 

 of points. 



