Stereo Copyright, L'nderu. 



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A PETRIFIED TREE 



This magnificent fossil is in the Petrified Forest of Arizona : and it affords one of the 

 most striking examples known of the solidification and petrifaction of material by the 

 infiltration of mineral salts. The trunk is now not merely encrusted with stone : it is 

 permeated by silica, and is, in fact, itself a stone as hard as flint. 



