ANALYSIS OF VOLCANIC ASHES. 



sent to me. The specific gravity was 2"36, and its chemical 

 composition was as follows : — 



Silica (Si O2) . 

 Titanic oxide (Ti 0..) . 

 Alumina (AI2 O3) . 

 Ferric oxide (Fe., O3) 

 Ferrous oxide (FeO) 

 Manganese monoxide (MnO) 

 Lime (Ca 0) . 

 Magnesia (Mg 0) . 

 Sodium oxide (Na^O) . 

 Potassium monoxide (Ko 0) . 

 Loss on ignition . 



65-92 

 0-40 



14-62 

 4-20 

 2-68 



trace 

 312 

 0-92 

 4-32 

 1-20 

 2-52 



