Letter from Peter Chalmers Mitchell 24 April 1934, about a Royal visit to the Zoo during which King George reminisced about his meeting with JP.
Letter from Jaqueline Nayman to CP 28 March 1977, about writing a biography of JP.
Letter from Helen Oates to CP 8 November 1981 with newpaper cutting from ‘Daily Telegraph’, ‘Kiss of life saves sick alligator’ [no provenance or date] and Chapter 12, ‘Department of Zoology’ from William T Stearn, ‘The Natural History Museum at South Kensington: a history of the British Museum (Natural History) 1753-1980’ (London, 1981) covering JP's work in the department.