I. 



le 



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ces 



) 



^ 



la 



■t has 



not 







^naiia 



ir 



elias 



froDi 



' own 



Qiove- 

 ifli iu 



imple 

 mere 

 crust 

 kve 



KriTi ; 



ifl 



^ -^ * - 



nding 

 ?ii as 

 mean 



land, 



1 



f and 

 Tffo 



have 



of 



^ 



{l)a» 

 tain 



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Iliads 

 tion-'' 



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of 



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IlC« 



t 



I 



r 



Ch. XXXL] 



CHANGES OF LEVEL, HOW CAUSED. 



197 



has tauglit the aboriginal Greenlander never to build his hut 

 near the water's edge. In one case the 



Moravian 



more than once to move 



upon which their large boats were set, and the old poles 

 still remain beneath the water as silent witnesses of the 

 change.^ 

 The fact of the gradual elevation and depression of land 



lOut vast areas of Europe and Arctic America, which 

 we have considered in this chapter, partly in the historical 

 period and partly in geological times immediately antecedent, 

 lead us naturally to speculate on the wonderful changes 

 which must be continually in progress in the subterranean 



^ 



foundations of these same countries. Whether we ascribe 

 these changes to the expansion of solid matter exposed to 

 hydrothermal action^ or to the melting of rock^ or the solidi- 

 fication of mineral masses, in whatever conjectures we indulge, 

 we cannot doubt that at some unknown depths the structure 

 of the crust of our globe is gradually undergoing very im- 

 portant modifications. 



* See Proceedings of Geol. Soc. No. 

 42, p. 208. I also conversed with Dr. 



Pingel on the subject at Copenhagen in 



1834. 



rf ^ 



