I picked up a book to day - This is your Home, a portrait of Mary Kingsley by Kathleen Wallace. Published 1956, first edition. Inside there was a letter from William Heinemann Ltd to the effect that 'the book was to be published in June 1956. I am sending you a proof and an advance copy of the jacket for this charming biography of Mary Kingsley, the redoubtable niece of Charles Kingsley.' Signed D.E. Priestly. Does this have any significance?