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18 



INTRODUCTORY ESSAY. 



Ill 



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decide the question, whether after the coral was 

 formed, the waters subsided or the rock was 

 elevated. The solution of this problem must form 

 a part of a general theory, and is left for those, 

 who, from extensive acquaintance with geological 

 facts, may be sufficiently qualified for the task of 

 generalization. 



i 



