The letter from E. Gordon Duff is dated Tuesday 7 January 1913, on paper embossed with the arms of the Athenaeum, Liverpool. It is written to 'Dear Mr Johnston' . The letter refers to 'the two books in the Laing portraits'. Apparently the book 'on the table in the sitting portrait was a copy of some Scottish Acts'. The book had been 'sold in the final Laing sale'. When Duff had seen it a couple of months before writing the letter 'it was in the hands of a London firm of booksellers'.
Duff goes on to say that the book in the second portrait 'is a MS of the Philobiblon' which 'is now in the University Library Cambridge.
The letter was placed inside a copy of Notices of David Laing : to which is added a chronological list of the various publications which were issued under his editorial superintendence from the year M.DCCC.XV. to the year M.DCCC.LXVIII inclusive, by Thomas George Stevenson, 1878, along with a Letter from Harry Gidney Aldis (1863-1919) to Mr. Johnston, with rubbing fragment which is now at E2010.33.