VOLCANO POPOCATEPETL AND ITS VICINITY. gi 



The enormous size of the boulders on the western slope of this mountain must 

 always attract the attention of the traveller. Many of the blocks are from twenty, 

 five to thirty feet in diameter, not rounded, like those on Popocatepetl, but having 

 plane feces and angular edges. They are sometimes isolated, but more generally 

 in ridges running down the slopes of the mountain, and commencing often fer 

 above the line of perpetual snow. 



