94 CHEMICAL A N ALTS IS 

 In ioo parts I found, 



Sllex, - - - - S°'75 



Argil, ... . i-,^^o 



Oxydofiron, _ . . 14-25 



Lime, - - - 10 



Soda, about - - - 4 



Muriatic acid, about - - 1 



97-50 



In analyzing thefe two lavas, I examined the different folu- 

 tions, with particular attention, for magnefia, and fulphuric 

 acid ; but could not dete<fl any traces of either of thefe fub- 

 flances. 



The refults of thefe analyfes fhow, that whins, and a certain 

 clafs of lavas, taken from remote quarters of the globe, confifl 

 of the fame component elements, united in each, nearly in the 

 fame proportion. The only circumflance in which they mate- 

 rially differ, is the lofs of fome volatile matter in the fire, which 

 is peculiar to the whins alone. 



We need not be now furprifed at the fa6ls mentioned by Do- 

 LOMiEU, and others, of foda being found about volcanos, or up- 

 on the furface of lavas ; as it has thus been fhown to exift in 

 thefe fubftances in combinatioia with their earthy bafes. 



The fadts and experiments I am next to niention will prove, 

 that whins and lavas are not the only ftones which contain fo- 

 da j 



