268 SIR CHARLES LYELL. 



hundred thousand years to produce the present 

 deposits. 



The coral reefs of Florida, built up at the rate of 

 one foot in a century, each reef adding ten miles 

 to the coast, have required, according to Agassiz, 

 at least one hundred and thirty-five thousand years 

 for building. Human remains in a bluff on the 

 shores of Lake Monroe, in Florida, he shows to be 

 at least ten thousand years old. 



Under the streets of Glasgow, Scotland, seven- 

 teen canoes have been dug up, one in a vertical 

 position, as if it had sunk in a storm, with the 

 prow uppermost. Twelve canoes one hundred 

 yards back from the river were found nineteen 

 feet beneath the surface. Almost all were single 

 oak trees, hollowed out by blunt tools, probably 

 stone axes, aided by fire, relics of the stone age. 



In caverns near Liege, France, human bones have 

 been found, with the cave-bear, elephant, rhinoce- 

 ros, and other species now extinct. Skulls found 

 in these primeval caves, especially one near Diis- 

 seldorf, called the "Neanderthal," "is the most 

 brutal of all known human skulls, resembling those 

 of the apes." These rude men probably were living 

 at the same time, or even later, than the makers of 

 the " refuse heaps " of Denmark. 



Wales has been under the sea to the depth of 

 fourteen hundred feet, as proved by glacial shells ; 

 its submergence and reelevation would require, by 

 careful computation, about two hundred and twenty- 

 four thousand years. 



