Popular Srirnct' Mnvlhl 



41, 



Above, A Perched 

 Granite Boulder 

 Left on a Sandstone 

 Base by a Glacier 

 Which Melted on a 

 Slope of the Famous 

 Yosemite Valley, 

 California. The 

 Sandstone Pedestal 

 Is Greatly Weath- 

 ered and in a 

 Hundred Thousand 

 Years, Perhaps, It 

 Will Wear Away 

 and Precipitate the 

 Heavy Boulder Into 

 the Canyon Below 



At Right, The Large 

 Boulder Which 

 Serves as the Base 

 Is Rapidly Wasting 

 Away While the 

 Smaller. Boulder on 

 Top of It — Weigh- 

 ing a Ton or so — 

 Shows No Signs of 

 Deterioration, Al- 

 though It Has Pro- 

 bably Rested in 

 This Position For 

 the Better Part of a 

 Thousand Cen- 

 turies or More 



