cover 1800 (27 Apr. and 28 Jun.) entire letters from the Melville correspondence, carried privately, endorsed "p. the Nyons/Capt. Aiken" and p. the Amphitrite/Capt. Mitchell" respectively; both rated "1" and both backstamped "LOMBARD ST. UNPAID PENNY POST" and with appropriate London oval d.s. (30 Jun. and 27 Aug.)