The Lancashire Canal or Kennel Coal, of which there is a plentiful and profitable Mine at Haigh near Wigan, when polished it looks like Marble. Coal being nothing but Bitumen hardened and concocted under Ground, I know not where better to insert a Sort of Liquid Bitumen that floats upon a Well at a Place from thence called Pitchford in Shropshire, whence it was brought me by the Reverend Mr. John Gardner of Chester.