INACCESSIBLE VALLEYS 



or fissures crossing each other nearly at right angles. In other and 

 more simple words, the bottom of the valley sank down to an unknown 

 depth, owing to its support being withdrawn from underneath during 



Fig. 4,— virgin's tkars waterfall, 3,000 feet, y 



OSEMITE VALLEY. 



some of: !those convulsive movements which must have attended the 

 upheaval of so extensive and elevated a chain, no matter how slow 

 we imagine the process to have been. 



After showing that subsidence is a well -ascertained fact, 



