54 



BUNSEN ON THE FORMATION OP 



Iceland, Palagonitic Sandstone near Reykjahildh. 



63. Oxygen found. Oxygen calculated. 



. . 35-09 18-57 18-31 



. . 10-60 



Silica .... 

 Alumina . . . 

 Protoxide of iron 13*65 

 Lime .... 4-83 

 Magnesia . . . 7*07 

 Potash .... 0-25 

 Soda . . ^ . 0-50 

 Water .... 17-25 

 Foreign residue . 11-13 



} 



9-05 



4-11 



9-16 



4-58 



100-419 

 After deducting the oxygen belonging to the phosphates and carbonates. 



