30 translator's preface. 



The translator will give some extracts 

 from the preface to M. De Willisen's transla- 

 tion, as it shows that some of the difficulties 

 met with by the former were not altogether 

 escaped by his German covfvere. 



"" After positive results had proved to me 

 most convincingly that M. Baucher's was 

 the best of all existing methods, I thought 

 that it would be useful to translate it. This 

 translation seemed at first much easier than 

 it proved in the sequel ; above all, it was 

 actually impossible for me to render in 

 German, as I wished, such technical French 

 expressions as attaques, accideynent, assoit- 

 ^lissement, ramener, rassembler, &c., retain- 

 ing their clearness and conciseness. In 

 German, I could only find expressions that 

 were incomplete. On this account, I have 

 put all the words, for which I could not find 

 a clear equivalent in German, in the original 

 French. 



