HEIRS DIG UP*Wom*n in Willtions Wh eroShoJ-fid Money.Special to The New York Ti*nes. j PHILADELPHIA, April Instructions to them left in a sealed document led the heirs of Miss Sallie Bennighoff of Allentown, Penn., the oldest woman in Lehigh County, who died in that city two weeks ago, to dig up the ground of her two farms near Lynn, at placesminutely described, where they unearthed over $3,000 in gold and banknotes which she had buried. The finding of the money solved the mystery of a strange light which neighbors had often seen in the meadows of Miss Bennighoff’s farms atnight. _Miss Bennighoff, who was 9lt; years old, left a fortune valued at $50,000 in farms and securities to her nieces and nephews.