A Descant on the Penny Postage, London: John Bohn, 1841, 1st ed., 38 p.; 2nd ed., 24 p.; Encore ed., with a few new cadences.
X.A.P., pseudonym for John Peace, 1785-1861, Keeper of the City Library, Bristol.

See also, The Athenæum, Jun. 21, 1862, pp. 818-820.  http://books.google.com/books?id=yBJEAAAAcAAJ
(p. 819)