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forms, like the lava pavements in Portici, and other towns in 

 Italy. The stones rise from 3 in. to 9 in. above the surface of the 

 grass ; the width averages from 4 ft. to 5 ft. ; but sometimes, where 

 very large stones occur, the walk is double that height. Sometimes 

 we are inclined to think that, if this rocky walk only rose an inch 

 or two above the surface, instead of 6 or 8 inches, the effect would 



