462 



BOTANICAL GAZETTE 



[JUNE 



the foredune. All of these causes tend to exclude any but the 

 most hardv species, and even these are never abundant. The 







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Fig. 2. — Average of mean daily evaporation rates in the 4 associations for grow 

 ing seasons 1910, 1911, 1912. 



im 



moisture 



plentiful. 



