THE ERUPTION OF BASDAI-SAN. 157 



The analysis of this white rock found within the crater gave : 



Si0 2 91-66 % 



A1A 2-88 



FeA 1-20 



CaO -36 



MgO -10 



S -50 



Loss by ignition 3*00 



99-70 



The following is the analysis of the water of the lake at the 

 crater-basin, by Mr. M. Hida, 1,000,000 parts of water containing 

 these substances : — 



XaCl ] 54*07 



Na 2 S0 4 34-46 



K 2 S0 4 30-00 



CaSO, 1136-57 



MgS0 4 286-09 



MgCOi 178-58 



Si0 2 86-40 



A1A + Fe 2 3 ... trace 



ILS 



1906-17 

 Total evaporation-residue = 1947*40 



The general description of the volcanic ash or dust that fell Volcani 

 during the eruption has already been given (p. 111). It has a bluish- 



