Mineralogy and Geology. 407 
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_ “Scovery was made in 1855. He adds also: “I have a pg ie 
es of a gigantic bone which Leidy examined and wrote me that s 
a belonged to an extinct Sloth. It came from beneath the mos' 
Populous part of the city, 30 feet, perhaps, below the surtace. 
| Another smaller. from another locality outside ne city west, I took 
~“8Ments of trees and sery tine stones bored by Lithodomi, lymg 
