Specification of Robert Johnston
Subtitle: medicine
Publisher: Great Seal Patent Office
Published: 1856
Place of publication: London
Language: eng
Description: Patent for "a medicine which I call Improved Essence of Mustard".
Notes: At head of title: A.D. 1798. No. 2226.

Cover title.

"Robert Johnston, of Greak [sic] Street, in the parish of Saint Ann's, Soho, in the county of Middlesex, chymist and apothecary".