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  • Chemical characters. Engraving by H. Ashby, 1799, after W. Jackson.
  • Chemistry: symbols of elements and substances. Coloured engraving by H. Ashby, 1799, after W. Jackson.
  • A chemist and his assistant as "puffers" heating a substance in a retort; representing a theatre critic who "puffs" the actor Joseph Holman at the bidding of his editor. Etching attributed to T. Rowlandson, ca. 1786.
  • Seventeen professors at Jefferson Medical College, Philadelphia. Colour process print after C.E. Miksch, 1923.