98 BUNSEN ON THE VOLCANIC ROCKS OF ICELAND. 



gonitic beds, and by a vaporization of water gave rise to the 

 formation of the red pneumatolytic amygdaloid. Here, likewise, 

 we find the metamorphism commencing as a physical necessity 

 from the melted trap masses terminating in a fumarole action, 

 whose products most perfectly resemble those of the solfatara 

 localities. These phaenomena present themselves very frequently 

 in Iceland, and still more frequently in the palagonitic trap for- 

 mations of the Faroe Islands, so distinguished for their abun- 

 dance of zeolites. 



It follows, with the most indisputable necessity, from these 

 last-mentioned facts, that this formation of zeolites does not 

 depend upon a removal and deposition of substances, but results 

 solely from a transformation of palagonitic rocks taking place 

 upon the spot. 



