57 



" retained in these deep trenches, con- 

 " vey nutriment to the soil and substrata? 

 " or give them more readily a plenitude 

 ** of moisture ?" 



To this question, every practical floater 

 will reply, that the nutriiftent should be 

 donvej^ed to the surface only ; and that 

 the soil, and substrata, are al\^ ays wet 

 enough, without tjie soaking of this ixi* 

 judiciously retained water. 



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