O/Z W.M.DAVIS SUBSIDENCE OF REEF-ENCIRCLED ISLANDS 



the occasional uplifted atolls elsewhere in the open ocean suffice to prove 

 that other processes than isostatic subsidence must be considered. Be that 

 as it may, the plausible possibility that volcanic islands may locally sub- 

 side, as if isostatically, is a most important contribution to the coral-reef 

 problem; this may, indeed, be the law for which it was said long ago, 

 ^'the isles shall wait." As far as its principle proves to be valid, it will 

 strongly supplement the several lines of independent evidence given on 

 the foregoing pages in favor of Darwin's theory of upgrowdng reefs on 

 subsiding foundations, although it discredits the broad application of his 

 theory to great areas of the ocean floor. 



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