212 



BOTANICAL GAZETTE 



[SEPTEMBER 



forest associations. It seemed all the more urgent that it should be 

 investigated because, with the growth of the city and the advance 

 of agriculture, it is rapidly disappearing. Consequently, in 191 1 

 the attention of Mr. E. M. Harvey was directed to this portion 

 of the problem and the range of evaporation and of soil moisture 

 as determined, and the results have been published (13), but' 



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Fig. 13. — Daily evaporation rates in the beech-maple forest at stations 16, 17, 18, 



19, and 20 during the season 191 1. 



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included in fig. 5. 



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no further reference at present. 



Harvey, 



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of shallow ponds and lakes formerly abundant in the Chicago region. 



