This image was first published in the following book: Thomas Joseph Pettigrew (1791-1865), Medical portrait gallery. Biographical memoirs of the most celebrated physicians, surgeons, etc., etc., who have contributed to the advancement of medical science. London, Fisher, son & co., 1838-40, 4 vol. 8º. For the book reference, see: online catalogue of the Library of Congress.

• Another version of this engraving, printed in a later 1846 print of the book, is available on the Smithsonian Institution Libraries website, in a folder “Portrait Prints of Men and Women of Science and Technology in the Dibner Library”, which indicates the following original dimensions for the portrait: Graphic: 11.5 x 9 cm / Sheet: 27.1 x 21.6 cm.

• See other line engravings or mezzotints by various artists, after the same painting, in the National Portrait Gallery, the earliest dated 1819-20.

• There's another description of this engraved portrait, on R.G. Watkins Book and Prints (commercial website):

“JOHN ABERNETHY [1764-1831] F.R.S. Surgeon to St Bartholomew's Hospital. Engraved Portrait of Abernethy, Three Quarter Length, r. hand on table, facsimile signature below, after Lawrence by J. Cochran. Stipple engraving, from Pettigrew's "Medical Portrait Gallery", 1839, 6.5in x 4.5in”

• Another description of this portrait, on Old Prints and Antique Engravings (commercial website), indicates these dimensions:
  • Paper size : 27.7 x 21.2 cm (10.8 x 8.3 inches)
  • Image size : 11.4 x 9.0 cm (4.4 x 3.5 inches)

Originally from en.wikipedia; description page is (was) here

• 10:07, 22 March 2004 Magnus Manske 418×649 (58,290 bytes) (In the en:public domain by age)