This section is from "The Domestic Encyclopaedia Vol3", by A. F. M. Willich. Amazon: The Domestic Encyclopaedia.
Pond-Weed, the Broad-leaved, or Potamogelon nutans, L. an indigenous perennial plant, growing in ponds and slow rivers ; flowering in the months of July and August.—The leaves of this weed float upon the surface of the water, and thus afford an agreeable shade to fish : its roots are said to be exceedingly grateful to swans.
 
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