^^ 



c^ 



.i 



TO 

 ALFRED LACROIX, PH.D., LL.D., Etc. 



MEMBRE DE l'INSTITUT DE FRANCE 

 SECRETAIRE PERPETUEL DE l'aCADEMIE 



DES SCIENCES 



CURATOR OF THE MINERALOGICAL DEPARTMENT IN 

 THE MUSEUM d'hISTOIRE NATURELLE, PARIS 



THIS BOOK IS DEDICATED BY THE AUTHOR 



AS A TRIBUTE OP ADMIRATION 



AND REGARD 



