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  • Isaac Swainson promoting his 'Velnos syrup', facing an onslaught of rival practitioners advocating mercury. Coloured etching by T. Rowlandson, 1789.
  • Isaac Swainson promoting his 'Velnos syrup', facing an onslaught of rival practitioners advocating mercury. Coloured etching by T. Rowlandson, 1789.
  • Isaac Swainson promoting his 'Velnos syrup', facing an onslaught of rival practitioners advocating mercury. Coloured etching by T. Rowlandson, 1789.