840 J. LeConte—Ancient Glaciers of the Sierras. 
C. General structure of the Sierras. 
more siliceous granite. Still lower down, about Yosemite, only 
this harder granite exists; both the slate and the softer granite 
has been entirely remove 
D. Ice-erosion and water-eresion compared. 
tain chain, is doubtless produced by general causes affecting 
the whole earth, iceetily i interi 
Ww 
amongst the high Sierras can for a moment doubt this fact, I 
caunot understand. Standing amongst these mountains, all 
* On Great Features of Earth’s Surface, this Jour., vol. iv, p. 47: 
