A very early edition of an Arthur Rackham illustrated Peter Pan. Note that this octavo edition is not one of the later cheap editions, but contains lovely reproductions of the Rackham illustrations protected by tissue guards.
About the book (from wikipedia):
Peter Pan in Kensington Gardens is a novel by J. M. Barrie, published in 1906; it is one of four major literary works by Barrie featuring the widely known literary character he created, Peter Pan.
It tells the story of how Peter left his family as an infant, became a friend of fairies, and (re)learned to fly.