s 



This volume which M. Nanquette, whose humble disciple I am 

 has asked nie to publish in my own name, is his handiwork more 

 than mine. As for myself I have only re-written the Course, which 

 I learnt at his feet. He has even been kind enough to revise my 

 manuscript and retouch with his own hand the more important por- 

 tions. It will hence not be affirming enough if I say that it is our 

 joint work. If the form is chiefly my own, the matter is princi- 

 pally his. 



Ch. Bboilliard. 

 Nancy, 1st May 1878. 



