486 



A JOURNEY IN BRAZIL. 



the boulders were universally decomposed and covered with 

 a uniform crust, so that it was necessary to split them in 

 order to ascertain their true nature. From distance to 

 distance along the road were immense fragments of rock, 

 sometimes twenty or thirty feet in height. These huge 



Garrafao, among the Organ Mountains. 



masses were frequently seen hanging on the brink of steep 

 declivities, as if, having broken off from the heights above, 

 and rolled down, they had been prevented from advancing 

 farther by some obstacle, and had become gradually em- 



