T. S&. Hunt on Volcanic Action. V6 
tt ean: the solution of the water-impregnated mass. 
rather than simple fusion, is the cause of liquidity, I am led to 
consider pressure as one of the efficient causes of the liquefac- 
tion of rocks, and to regard its diminution as leading to solidi- 
fication.” ]* 
That the water intervenes not only in the phenomena of vol- 
canic eruptions, but in the crystallization of the minerals of 
ms rocks in Hungary and Armenia, made by Streng, and pat 
crepancies between the actual and the calculated results as to 
ow grave doubts on Bunsen’s hypothesis, 
* See in this connection, Mr. Serope on “The Character of Lavas.” in th 3 
ical Magazine for March 1870. , in the Geolog. 
