lMfiJ 



WILLS — FLORA OF NORWAY 107 



by setting up hypotheses of tremendous convulsions of nature 

 such as elevated and depressed land connections, climatic 

 changes from cosmic causes, the oscillatory movement of the 

 poles, etc., which can neither be proved nor disproved, as they 

 lie beyond the spheres in which our present knowledge has a 

 firm foundation on which to stand. 



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