268 C. E. BUTTON 



All volcanic lavas contain water, and those whose reservoirs are 

 near the surface contain a large amount of it Those which have a 

 deeper origin contain a smaller amount of it. The deeper lavas are 

 hotter, and are erupted with less violence and in greater mass, than the 

 shallow ones, and the reason is obvious. 



The foregoing is a brief abstract of a portion of a book now in 

 preparation on volcanism. 



