viii PREFACE. 



supplied for the purpose by Professor Lilljeborg. Some few alterations liave been made in the 

 text of this essay by the author during the translation, and some notes not found in the original 

 are added. The latter are distinguished by being placed in brackets [ ], with the date 1865. 

 The few notes that I have thought necessary to add throughout the work are distinguished by the 

 initials W. H. F. 



■nth June, 1866. 



