Tree and leaf [On fairy-stories, and Leaf by Niggle]

Blurb

Tree and Leaf is a small book published in 1964, containing two works by J. R. R. Tolkien:
a revised version of an essay called "On Fairy-Stories"
an allegorical short story called "Leaf by Niggle".
The book was originally illustrated by Pauline Baynes.
"Mythopoeia" was added to the 1988 edition. Later versions also include "The Homecoming of Beorhtnoth Beorhthelm's Son".
Both pieces were re-issued in the collection The Tolkien Reader, and have also appeared in various subsequent collections.