...volcanic. The beginner will easily conceive that the influence of subterranean heat may extend downwards from the crater of every active volcano to a great depth below, perhaps several miles or leagues (see Frontispiece), and the effects which are produced deep in the bowels of the earth may, or rather...

...volcanic. The beginner will easily conceive that the influence of subterranean heat may extend downwards from the crater of every active volcano to a great depth below, perhaps several miles or leagues (see Frontispiece), and the effects which are produced deep in the bowels of the earth may, or rather...

...beginner will easily conceive that the influence of subterranean heat may extend downwards from the erater of every active volcano to a great depth below, perhaps several miles or leagues (see Frontispiece,) and the effects which are produced deep in the bowels of the earth may, or rather...

...rocks." The beginner will easily conceive that the influence of subterranean heat may extend downwards from the crater of every active volcano to a great depth below, perhaps several miles or leagues (see Frontispiece), and the effects which are produced deep in the bowels of the earth may, or rather...

...volcanic. The beginner will easily conceive that the influence of subterranean heat may extend downwards from the crater of every active volcano to a great depth below, perhaps several miles or leagues (see Frontispiece,) and the effects which are produced deep in the bowels of the earth may, or rather...

...volcanic. The beginner will easily conceive that the influence of subterranean heat mi^ extend downwards from the crater of every active volcano to a great depth below, perhaps several miles or leagues (see Frontispiece,) and the effects which are produced deep in the bowels of the earth may, or rather...

...rocks." The beginner will easily conceive that the influence of subterranean heat may extend downwards from the crater of every active volcano to a great...even in composition, may originate simultaneously, the one at the surface, the other far beneath it. By some writers, all the rocks now under consideration...

...downwards from the crater of every active rolcano to a great depth below, perhaps several miles or league*, and the effects which are produced deep in the bowels of the earth may, or rather most be, distinct; so that volcanic and pltttonic rock*, each different in texture, and sometimes even...

...rocks." The beginner will easily conceive that the influence of subterranean heat may extend downwards from the crater of every active volcano to a great...even in composition, may originate simultaneously, the one at the surface, the other far beneath it. By some writers, all the rocks now under consideration...

...rocks." The beginner will easily conceive that the influence of subterranean heat may extend downwards from the crater of every active volcano to a great...or rather must be, distinct ; so that volcanic and plutonio rocks, each different in texture, and sometimes even in composition, may originate simultaneously,...