1894.] NATUBAL SCIENCES OF PHILADELPHIA. 445 



in combustible minerals," "Volcanic rocks," "Sea water," "Thermal 

 springs and metallic lodes," "Chemical composition of planetary- 

 bodies," and finally, the crown of his labors, "La geologie experi- 

 mentale," "Recherches experimentales sur les forces qui ont du 

 produire le metamorphisme" (1857-1860), and the classic work of 

 recent years "Les eaux souterraines. " 



He has also published a valuable work "Experiences synthetiques 

 relative aux meteorites," and "Classification adoptee par le Musee de 

 I'Histoire Naturelle de Paris." 



The following were ordered to be printed : — 



