INTRODUCTION. 11 



two works have the same plan ; the division of matter is the same, 

 because it was necessary above all that the reader should connect 

 in each subject the principle with its consequences, so that thus 

 practice and theory may be mutually understood. 



In conclusion I must add, in the hope of deserving at least the 

 indulgence of the public for the literary form of this work, that I 

 have been more anxious to instruct than to amuse. The subject 

 does not border on fiction ; but I am convinced it will be none the 

 less interesting for all that. The important point was to treat the 

 subject with all possible clearness ; and here, as in some other 

 works which have been received with favour, I have especially 

 endeavoured to be clear. 



