Basalt and of Lava from Etna. 

 The gelatinizing portion contains : — 



29 



98.98 



The non-gelatinizing portion : — 



V01.83 



The lava as a whole therefore contains 



Protoxide of manganese, 0.54 



99.95 



Onygen. 

 25.36 

 7.54 

 3.71 

 2,61 

 1.77 

 0.88 

 0.13 

 0.12 



' The analyses afford no result from which an accurate conclu- 

 sion can be formed regarding the composition of the lava ; it is 

 probable that more than one component part has a share in the 

 solubility in acids, and that thus the different portions cannot be 

 calculated separately. But the circumstance is worthy of notice, 

 that lava, a genuine volcanic product, does not contain a trace 

 of water, while basalt has never been found without water. 

 Kennedy pointed out the existence of soda in the lava of Etna 

 so early as the year 1798, in his Memoir in the Transactions of 

 the Royal Society of Edinburgh. 



